Case: Thomas Otis Le Roy, and David Smith, Plaintiffs in Error, v. Benjamin Tatham, Junior, George N. Tatham, and Henry B. Tatham
Abbreviation: Le Roy v. Tatham
Decision Date: 1852-12
Docket Number: 
Citation: 14 How. 156
Volume: 55
Reporter: United States Reports
Court: Supreme Court of the United States
Jurisdiction: United States
Parties: Thomas Otis Le Roy, and David Smith, Plaintiffs in Error, v. Benjamin Tatham, Junior, George N. Tatham, and Henry B. Tatham.
Judges: - Mr. Justice Nelson, Mr. Justice Wayne, and Mr. Justice Grier dissented.
Pages: 156–189

Head Matter:
Thomas Otis Le Roy, and David Smith, Plaintiffs in Error, v. Benjamin Tatham, Junior, George N. Tatham, and Henry B. Tatham.
In a patent for improvements upon the maclunery used for making .pipes and tubes from lead, or tin, when in a set, or • solid’, state, by forcing it under great pressure, from out of a receiver, through apertures, dies, and cores, the claim of the patentees was thus stated: “ What we claim as oür invention, and, desire to secure by letters-patent, is the combination of the following parts, above described, to wit, the core and-bridge, or guide-piece, the chamber, and the dip, when used to form pipes of metal, under heat and pressure, in the manner set forth, or in any other manner . substantially the same.”
The Circuit Court charged the jury, “ that the originality did not consist in the novelty of the machinery, but in bringing a newly discovered principle into practical application, by which an useful article of manufacture is produced, and wrought pipe made as distinguished from cast pipe.”
This instruction was erroneous.
Under the claim of the patent, the combination of the machinery must he novel. The newly discovered principle, to wit, that lead .could be forced, by extreme pressure, when in a set or solid state, to cohere and form a pipe., was not in the patent, and-the question whether it was or was not the subject of a patent, was not in the case.
Mr. Justice Curtis, having been- of counsel for the defendants in error, upon the letters-patent drawn in question in this case, did not sit at the hearing.'
This case was brought up, by writ of error, from the Circuit Court of the United State’s for the Southern District of New York.
The declaration was filed by the defendants in error, on the 8th of May, 1817, to recover damages in a plea of trespass upon'the-case, from the plaintiffs in error, and Robert. W. Lowber, for the alleged infringement -of their patent, for new and useful .improvements in machinery, or. apparatus for making pipes and tubes from metallic substances.
The declaration alleged, that John and Charles Hanson, of Huddersfield, England, were the inyentors of the alleged improvements, on or befbrfe the 31st of August, 1837.
-That on the 10th of January, 1840,.the Hansons, assigned, in writing, to H. B. and B. Tatham, (two of the defendants in error,) the full and exclusive right to the said improvements.
• That on the 29th of March, 1841, letters-patent of the United States were granted to'H. B. & B. Tatham, as assignees of the Hansons, for the said improvements.
• That .on the 12th of October," 1841, H. B. & B. Tatham-, assigned to G. N. Tatham, (the remaining defendant in error,) one undivided third part of the said letters-patent.
That, on the 14th of March, 1846,-the said' letters-patent having; been surrendered', bn account "of the defective specifications of the said improvements,' new letters-patent were issued therefor, on an amended specification, whereby there was granted to the plaintiffs below, their heirs, &e., for the term of fourteen years from the 31st of August, 1837, the full and exclusive right of making, vending, &c., the said improvements ; a description whereof was annexed to and nade a part of such patent.
That the letters-patent were of the value of $50,000; and that the defendants below had wrongfully and unlawfully made, used; .and vended the said improvements, and made lead pipe to the amount of 2,000 tons, thereby to the injury of the plaintiffs,' $20,000.
To this declaration, the defendants, Le Roy and Smith, pleaded not guilty; the defendant, Lowber, making no defence, and permitting a default to be taken against him.
The cause was tried at the April Term, 1849, and a-verdict rendered by the jury in favor» of the plaintiffs, for $11,394, and costs, and a bill of exceptions was tendered'by the defendants below.. .
On the trial of the cause below, the plaintiffs produced, —
1. Their patent of 1846, and the specification referred to
therein, and making a part of the same. '
2. They read in evidence certain agreements between the defendant, Lowber, and the defendants, Le Roy and Smith.
3. They gave evidence, tending to prove that J. & C. Hanson were the original and first inventors of the improvement; that the invention was a valuable one, &c.
4. That lead, recently become set, under heat and pressure, m á close vessel, would reunite perfectly after a separation of its parts; that, in the process described -in the said patent, pipe was so made; thar the Hansons were the first and original discoverers thereof; and that such discovery, and its reduction to a practical result, in the mode described in the patent, was useful and important.
5. That the defendants, Smith and Leroy, had been .jointly engaged with Lowber in making lead pipe upon the plan- described in the letters-patent, and selling the same, and had thus made and sold large quantities of pipe; ,that the. agreement between them, relative to the manufacture of pipe, was colorable only, and was -made as a cover to protect Le Roy'and Smith, and throw the responsibility on the defendant, Lowber, who was insolvent. '
6. That the improvement described in the said letters-patent was the same invention for which letters-patent had been granted to the Hansons,* in England, and to H. B. & B. Tatham, here, as their assignees.
7. .That the plaintiffs had been ready, and had offered to sell the said invention, and had sold the same for a large portion of the United States, within the last eighteen months.
The defendants below then read in evidence, —
1. The description of the English patent to the Hansons.
2. The patent to H. B. & B. Tatham, of 1841, and the specification thereof.
3. The specification of an English patent, granted to Thomas Burr, of 11th April, 1820.
4. The patent and specification of Burroughs Titus, granted in 1831.
5. The patent granted to George W. Potter, in 1833.
6. The evidence of George Fox, tending to show the invention and use by him of a similar machine, in 1830.
7. The specification of a patent to John Hague, in 1822.
8. The specification of a patent granted to Busk & Harvey, in 1817.
9. The specification of a patent granted to Ellis & Burr, in 1836.
10. The specification of a patent granted to Joseph Bramah, in 1797. '
11. The defendants then gave evidence tending to prove that J.,& C. Hanson were not the original'and first inventors-of the combination of machinery described in the letters:patent.
12. That the invention was not useful, nor the lead pipe,made upon the plan described, good.
13. That the combination of machinery described in public works, as having been invented by Titus, Potter, Fox, Hague, Bramah, and Busk & Harvey, were substantially the same as that described in the plaintiffs’ patent.
14. That lead, when recently become set, under, heat and extreme pressure, in a close vessel, would not reunite perfectly. after a separation 'of its parts; and that, in the process as described in the plaintiffs’ patent, it was not in a set, but in a fluid state when it passed .the bridge.
15. That the defendants, Le Roy & -Smith were not concerned in the manufacture of the pipe, or in making or using the machinerythat it was made for them by the defendant, Lowber, at a certain price per hundred pounds; and that they had not infringed upon the patent of the plaintiffs.-
16. That the improvement described in the plaintiff’s patent, of 1846, was not the same- invention as that for which letters-patent had previously been granted to the Hansons, and to H. B. & B. Tatham.
17. That, for the space of eighteen months, from the date of the patent of 1841, the plaintiffs fiad neglected to put and continue on sale to the public, on reasonable trust, the invention or’discovery for which the said patent issued.
The evidence being closed, the case was argued before the jury, after the court had given the charge, which will be presently stated. The jury found a verdict for the plaintiffs, which, when increased, by the court, amounted to, $11,748.60. The following bill of exceptions brought up the rulings of the court upon the several points made:
The evidence being .closed, the Judge charged the jury
That the first question which it was material to determine was, what was the invention or discovery of John and Charles Hanson, for which their patent had issued, as the precise character .of that invention had been the subject' of controversy on the trial.
The patentees state in their specification, that the invention consists in certain improvements upon, and additions to, machinery for making pipes of metal, capable of being pressed, as described in Burr’s patent, dated April 11,1820. They then describe Burr’s apparatus, and the process by which the pipe .was made by it, and state the defects of that plan, in consequence of which, they say, it failed to go into general use.
These defects they claim to have overcome and remedied; and state that they had found that lead, and some of its alloys, when just set, or short of fluidity, and under heat and great pressure, in a close vessel, would reunite, after a separation of its parts, as completely as if it had not been separated, or, in other words, that, under these circumstances, it could be welded.
That, on this discovery, and in reference to "and in connection with it, they made a change in the machinery of Burr, by which they succeeded in making perfect pipes, and were enabled to use a bridge at the end of the cylinder and short core, and thus surmount the difficulty of the Burr machine.
They also state, that they do not claim any of the parts — the cylinder, core, die, or bridge; but that they claim the combination when used to form pipes of metal, unde11 heat and pressure, in the way they have described.
There can be no doubt that, if this combination is new, and. produces a new and useful result, it is the proper subject of a patent. The result is a new manufacture.
And even, if the mere combination of machinery in the abstract is not new, still, if used and applied in connection with, the practical development of a principle, newly discovered; producing a new and useful result, the subject is patentable. To which last opinion and decision, the counsel for the defendants did then and there except.
In this view, the improvement of the plaintiffs is the application of a combination of machinery to a new end, — to the development and application of a new principle, resulting in a new and useful manufacture.
That the discovery of a new principle is not patentable; but it must be embodied and brought into operation by machinery, so as to produce a new and useful result.
Upon this view of the patent, it is an important question, for the jury to determine, from the evidénce, whether the fact is estáblished on which the alleged improvement is founded, that lead, in a set or semi-solid state, can thus be reunited or welded after separation.
The Judge here commented briefly upon the testimony, referring to the experiments which were testified to, and the results of which were exhibited to the jury, on the part of the plaintiffs and defendants, and, in continuation, stated:
That there was one experiment which was testified to by Mr. Keller, and the result of which was shown to the jury, which was made under circumstances that seem not to be subject to ■any misapprehension, and which, if he is not mistaken, and his testimony is correct, would seem to settle the question. But this was a question of fact, to be decided by the jury on the evidence. Hereupon, the counsel for the defendants excepted to this part of the charge of the Judges..— That it had been objected, that the improvement described in the patent of March 14, 1846, was different from that of March 29,1841. The act only authorized a reissue for the same invention, the first specification being defective. ■— That he had compared the descriptions contained in ’ the two patents; and, though the language was in some parts different, it would be found that the improvement was substantially the same, and that he therefore apprehended they would have- no great difficulty in this branch of. the case; to which the defendants’ counsel excepted. — That it was also objected, that- the plaintiffs’ patent was invalid, for want of originality; that the invention had been before described in public works, and Bramah, Hague, Titus, Fox, and Potter, were relied on by the defendants. — That, in the view taken by the court, in the construction of the patent, it was not'material, whether the mere combinations of machinery referred to were similar to the combination used by the Hansons; because the originality did not'consist in the novelty of -the machinery, but in bringing a newly-discovered principle into practical application, by which a useful article of manufacture is produced, and wrought pipe made, as distinguished from cast pipe. Hereupon the defendants’ counsel excepted.
That in the patents referred to, from the year 1797 to 1832, the combination which was claimed to be identical, was confessedly used for making pipe, by casting with fluid- lead in a mould, and after it was set by the application of water, forcing it out.
And the question is, whether any of these inventions are substantially the same as the plaintiffs’; whether, even if by these ' modes pipe had been successfully made for common use, it Would have been made in the same manner as the Hansons’; to which opinion the counsel for'the defendants excepted.
That it was further objected that the patentees have forfeited their rights, on account of having omitted to put and continue the invention on sale within eighteen months after the patent was granted, upon reasonable terms. The Judge here commented upon the testimony on this part of the case, and in continuation said:
That it was not essential, under the section of the statue referred to, that the patentees should take active means for the purpose of putting their invention in market, and forcing a sale, but that they should at all time's be ready to sell at a fair price, when a reasonable offer was made.
That it was for the jury to say whether it was .put and continued on sale, under this view of the law; to which opinion the counsel for the defendants excepted.
. That the defendants, LeRoy, and. Smith, contend that they have not infringed the plaintiffs’ patent; that they were but the purchasers of the pipe, and that Lowber was the manufacturer, under the agreement which has been read.
The Judge here referred to the evidence on this branch of the case, and said:
That if the contract made by the defendants with Lowber, was bond fide, and they had no connection with the manufacture of the articles, except to furnish lead and pay him a given price, deducting'the expenses; and if the contract was in fact carried . out and acted' upon in that manner, then the' defendants would not be liable. But if the agreement was- only colorable, and was entered into for the purpose of deriving the benefit and profits of the business, without assuming the responsibility for the use of the invention, and for the purpose of throwing the responsibility on Lowber, who was insolvent, then they were as responsible as he was.
That aiding and assisting a person in carrying on the business and in operating the machinery, would implicate the parties so engaged. If, therefore, these defendants participated actively in conducting the machine, directing and supervising its operations; if the evidence establishes that position, then, .as aiding and assisting, they are as responsible as Lowber, (to which last opinion and decision the defendants’ counsel excepted.)
Prior to the giving of the preceding charge to the jury, the defendants’ counsel- requested the court to instruct them according to the following- written proposition submitted; and his honor, after he delivered the said charge, took up the said propositions in their order, and gave the instructions to the jury, which are réspectively subjoined thereto.
Proposition I. If the jury believe that the agreements executed on the 13th of April and 13th of May, 1846, by which Lowber, as manufacturer, was to make the pipe for LeRoy & Co., on his machine, at 55 cents the 100 pounds,' was real and bond fide, on an actual dissolution of the partnership of Lowber & LeRoy, and not colorable to throw the responsibility of working the machine on Lowber alone, then the plaintiffs cannot recover.
-Upon which, his honor said that he had already given all the' instructions he deemed necessary on that point; the proposition was correct, and it was for the jury to decide that fact.
Proposition II. That even if the Tathams first introduced the pipe in question in this country, as an article of commerce, • that does not give them any right to recover, unless the patents under which they claim were good and valid, for an invention not before known, used, or described -in a public work.
Upon which his honor instructed' the jury, as requested by the defendants’ counsel.
Proposition III. That if the jury believe that the combination patented by the plaintiffs was before patented by Burroughs Titus, or any one else in this country, or patented and described in a well known public work abroad, the plaintiffs cannot recover, although such machines thus patented were not actually put in operation, so as to make pipe for the public.
Upon which his honor instructed the jury that he had already stated to.them that the plaintiffs’ invention did not consist in the mere combination of machinery, and, therefore, if those patents were for casting lead pipe, the point was not material; that it was not necessary that they would have made pipe for public use to defeat a subsequent patent. To which instruction, and refusal to instruct, the jury as requested, the defendants’ •counsel excepted.
Proposition IV. That the Tatham patent is void on its face, the Burr machine having the entire combination, including heat and pressure, and the lead in a set state. The patent is void for claiming too much; should only have been for the improvement, viz. substituting the bridge and short 'core for the long core, and not for the whole combination.
His honor declined to give this instruction, to which the'defendants’ counsel excepted.
Proposition. V. That the bridge and short core having been before patented in this country by Burroughs Titus, and also before used in other machines, no claim could be made for introducing into Burr’s combination such bridge.
Upon which his honor instructed the jury as follows: Undoubtedly that is so, but that is not the plaintiffs’ claim.
Proposition VI. That the state-of the lead, when used as described in the plaintiffs’ specification, being a principle of nature, is not the subject of a patent, either alone or in combination with the machine mentioned in that specification.
To which his honor stated, the first part of the proposition was correct,- and the latter part not; and the defendants’ counsel excepted.
. Proposition VII. That the using of a metal in a certain state, or át a certain temperature, alone, or in cambinátion with a machine, was not the subject of a patent.
To which his honor stated, I have already instructed the jury that the invention, as described by the Hánsons, is a patentable subject; to which the defendants’ counsel excepted.
Proposition VIII. That if the jury believe that the combination of cylinder, piston, bridge, short core, die, and chamber, under heat and pressure, was before patented in this country, by Burroughs Titus, then the plaintiffs cannot recover.
Whereupon, his honor instructed the jury, that novelty in the mere combination of the machinery was not essential to the plaintiffs’ right to recover, except as connected with the development and application of the principle before mentioned; to which the defendants’ counsel excepted.
Proposition IX. That if the jury believe that the same com-, bination of cylinder, piston, bridge, short core, die, and chamber, under heat and pressure, had before been patented in England, by Bramah, and published in a well known work, then the plaintiffs cannot recover.
His honor instructed the jury, that Bramah’s patent and the Tathams’ were not identical, and declined to instruct them as requested; to all which the defendants’ counsel excepted.
Proposition X. That if the jury believed that the Burr, Bramah, Titus, and Hague machines, or either of them, were published to the world in well known public works, and had the same combination, in whole or in part, as the Hanson machine, up to a certain point, the Tathams’ patent is void; for claiming too much, viz. the whole combination.
His honor instructed the jury, that he had explained to them his views on that part of the case, and declined to instruct them as requested, in the form of which the proposition was stated; and to which the defendants’ counsel excepted, .
Proposition XI. That the reissue of the patent of 1846, on which alone the plaintiffs can claim, was not warranted by the patent of 1841, it being for a different, and not the saíne invention, misdescribed by inadvertence, accident, or mistake; and, in fact, was a new patent, under color of a reissue.
That if the jury believe that the reissue' of 1846 was. for a different invention from the patent of 1841, and not for the same invention, misdescribed by inadvertence, accident, or mistake, then the plaintiffs cannot recover.
His honor declined to instruct the jury according to the first branch of this proposition, to which the defendants’ counsel excepted; but did instruct them in the affirmative, upon the last branch thereof.
Proposition XII. That if the jury believe that the combination patented, was before described in.some well known public! work, either in this country or in England, the plaintiffs cannot recover, although such machine, or the pipe made by it, was never introduced in this country.
Upon which his honor instructed the jury in the affirmative.
Proposition XIII. If the jury believe that the combination claimed was before known or used, to make lead pipe, by others than the Hansons or the Tathams, 'the plaintiffs are not entitled to recover, no matter how limited such knowledge or use was, if the invention was not kept secret.
Upon which his honor instructed the jury in the affirmative.
Proposition XIV. That if the Maccaroni machine, or the Busk and Harvey clay-pipe machine, contained the same combination as the plaintiffs’ machine, that the plaintiffs cannot recover, by reason of applying the same combination -to a new use.
Which instructions his honor declined to give, and stated that he had explained to them bis views on that subject; and the defendants’ counsel excepted.
Proposition XV. That if the jury believe that Mr. Lowber’s machine was used by his men when the lead was in a fluid, and not in a set, or solid state, then there was no infringement, and the plaintiffs cannot recover, if the plaintiffs’ patent were valid.
Upon which his honor instructed the jury in the affirmative.
.Proposition XVI. That the jury are the sole and exclusive judges, as questions of fact, whether the combination and process were the same in plaintiffs’ machine as was in Bramah’s, or in any other of the machines proved on the trial.
Upon which his honor charged the jury that this was so undoubtedly, subject, however, to the principles of law, as laid down in his preceding charge and instructions; to which the defendants’ counsel excepted.'
Proposition XVII. That if the jury believe that the lead, when it may be successfully used to make pipe with plaintiffs’ machine, must not be in a set or solid state, as described in their specification, and that it can only be thus used in a fluid or pasty state, then that the patent is void,- and the jury should find for the defendants, on the ground that the specification does not fairly and fully describe the nature of the invention claimed, nor the condition in which the'- lead should be used, so as 'to enable the public to ascertain the true nature of the invention, the manner of using the machine, and the condition in which the lead ought to be used.
Which instruction his honor answered in the affirmative.
The jury then retired to consider their verdict, under the said charge and instructions ; and subsequently, on the 25th day of May, 1849, returned into court with a verdict for the said plain-' tiffs for $11,394 damages, and six cents costs.
And, inasmuch ■ as the said several matters aforesaid, do not appear by the record of the said verdict, the said defendants’ counsel did then and there request his honor, the said Judge, to' put his seal to this bill of exceptions, containing the said several matters aforesaid; and his honor, the said Judge, did, in pursuance of the said request, and of the statute in such case made and provided, put his seal to this bill of exceptions, containing the said several matters aforesaid, at the city of New York, aforesaid, the same 25th day of May, 1849. S. Nelson.
The case was argued by Mr. Gillett and Mr. Noyes, with whom was Mr. Barbour, for the plaintiffs in error, and by Mr. Cutting and Mr. Staples, for the defendants in error.
The points made by the counsel for the plaintiffs in error, were the following.
1. In construing a patent, and deciding what are the inven? tions patented thereby, the summing up is conclusive. Nothing is patented but what is expressly claimed. Moody v. Fiske, 2 Mason, 112, 118; Rex v. Cutler, 1 Starkie, R. 354; Davies on Patents, 398, 404; Bovil v. Moore, 2 Marsh. R. 211; Wyeth v. Stone, 1 Story, R. 285; Hovey v. Stevens, 3 W. & M. 17.
2. What is described in a patent, and not claimed, whether invented by the patentee or not, is dedicated to the public, and cannot be afterwards claimed, as a part of his patent, in a reis-, sue, or otherwise. Battin v. Taggart, Judges Kane and Grier, September 10, 1851; 6th section of act of 1836; Mellus v. Silsbee, 4 Mason, 111; Grant v. Raymond, 6 Pet. 218; Shaw v. Cooper, 7 Pet. 292, 322, 323; Pennock d. Dialogue, 2 Pet. 1, 16.
3. A patent Void in part, is void in whole, except when other wise provided by statute. Wyeth v. Stone, 1 Story, R. 285, 273-293-4; Moody v. Fiske, 2 Mason, 118, 119; Woodcock v. Parker, 1 Gall. 438; Evans v. Eaton, 7 Wheat. 356; 5 Cond. R. 302, 314; Bovil v. Moore, Davies’s Patents, 398; Id. 2 Marshall, 211; Hill v. Thompson, 3 B. Moore, 244; Bevinton v. Hawks, 4 B. & Ald. 541; Saunders v. Aston, 3 B. & Ald. 881; Kay v. Marshall, 5 Bing. N. C. 492; Gibson v. Brand, 4 M. & Gr. 178; McFarlane v. Price, 1 Starkie, 199; Minton v. Moore, 1 Nev. & P. 595; Rex v. Cutler, 1 Starkie, R. 359.
4. The Judge was bound .to present to the consideration of the jury, as a question of fact, in the words of the statute, whether the patentee, being an alien, “ had failed and neglected, for the space of eighteen months from the date of the patent, to put and continue on sale to the public, on reasonable terms, the invention for which the patent issued.” Tatham and others v. Loring, decision by Judge Story on this patent, cited on brief.
5. It was error In the Judge to instruct the jury that he had examined the surrendered and reissued patent, and fouqd the improvement the same. He should have submitted the question, as one of fact, to the jury, for them to determine, upon the. evidence, of the weight of which they were the exclusive judges. It was also error to instruct them that Bramah’s and Tatham’s patent were not identical. That was a question for the jury. Curtis, sec. 381; Carver v. Braintree, 2 Story, R. 432; Stimpson v. West Chester Railroad Co. 4 Howard, 381.
6. The question, whether-the combination had been previously patented, or described in a printed publication, was one of fact, which should have been submitted to the jury.
7. Applying an old machine to a new use, or to produce a new result, is not the subject of a lawful patent. Boulton v. Bull, 2 H, Bl. 487; Lash v. Hague, Web; Pat. 207; Crane v. Price, 4 Mann. & Grang. 580; Huddart v. Grainshaw, Web. Pat. 8; Howe v. Abbott, 2 Story, R. 190, 193; Bean v. Smallwood, 2 Story, R. 408, 410; Hovey v. Stevens, 1 Wood. & M. R. 290, 297, 298; Kay v. Marshall, 5 Bing. N. C. 492, (35 Com. Law R. p. 194, 197, 198); Gibson v. Brand, 4 Mann. & Grang. 179, (43 Com. Law; 100, 110); Hotchkiss v. Greenwood, 11 Howard, 248, 266; Curtis, § 26, 27.
8'. Making an addition to an old combination does not authorize a patent for the whole combination. Such a patent would be broader than the invention, apd void.
.Act- 1836, sec. 6. Hindmarch on Pat. 184, 190, and cases cited; Basil v. Gibbs, Davies’s Pat. 398, 413; Whittemore v. Cutler, 1 Gall, 478; Barrett v. Hall, 1 Mason, 447, 474; Moody v. Fiske, 2 Mason, 117; Prouty v. Draper, 1 Story, R. 568; Howe v. Abbott, 2 Story, R. 190; Brooks v. Jenkins, 3 McLean, 433; Evans v. Eaton, 1 Pet. C. C. R. 322; Curtis, sect. 8, 9, 10, 11; Brooks v. Bicknell, 4 McLean, 64, 73; Root v. Ball, 4 McLean, 177, 180; Parker v. Haworth, 4 McLean, 370, 373; Prouty v. Ruggles, 16 Pet. 336, 341; Evans v. Eaton, 7 Wheat. 356; 5 Cond. R. 302, 314.
9. The plaintiffs, Henry B. and Benjamin Tatham, not being inventors, were not authorized to surrender the patent granted to them as assignees, and receive a reissued patent thereon. Patent act of 1837, sec. 6.
10. The reissued patent is void, because issued to a party who was neither an original inventor, nor his assignee. Act of 1837, sec. 6.
11. Neither a principle nor an effect can be patented, but a patent must be for a mode of embodying the former to produce the latter, invented by the patentee. Kemper’s case,- by Chief Justice Cranch, in Curtis on Pat. 500; Wyeth v. Stone, 1 Story, R. 285; Hill v: Thompson, 8 Taunton, 375; S. C. 4 Com. L. R. 151; Brunton v. Hawks, 4 Barn. & Ald. 541; S. C. 6 Com. L. R. 509; Moody v. Fiske, 2 Mason, 118; Whittemore v. Cutler, 1 Gall. 478, 480; Stone v. Sprague, 1 Story, R. 270, 272; Blanchard v. Sprague, 3 Sumner, 535, 540; S. C. 2 Story, R. 164, 194; Howe v. Abbott, 2 Story, R. 194; Smith v. Downing, decided in 1850 by Judge Woodbury; Detmould v. Reeves, Grier and Kane, Judges, 1851; Boulton v. Watt, 2 H. Bl. 453; S. C. Davis on Pat. 162, 192.
The counsel for the defendants in error made the following points:
No- exception was taken to the admission or exclusion of testimony; but solely to the Judge’s charge.
The invention for which the patent was granted consisted in the discovery, that, under certain conditions, and by the use and application of certain methods, lead, and some of its alloys, while in a set state, could, after being separated into parts, be re-united and welded, and thus formed into pipe ; and also- of the mode of doing this; producing thereby a new article of manufacture, wrought lead pipe — avoiding the objections which' had always prevented success in casting pipe; and by- this discovery overcoming the defects of Burr’s method, on which this was an improvement./. :
The patentees, in describing the invention, say that they “have found from experience that lead and some of its alloys; when- recently become set, or in a condition just short of fluidity, being still under heat and extreme pressure, in a close vessel, will reunite perfectly after a separation of its parts,” and that, therefore, they construct-their machinery as follows — arid then proceed to describe the machinery or apparatus, as adapted by them to this discovery, and by whiph they produce the practical result' above stated.
After describing the apparatus and the modes of using it, the patentees repeat, “ that the remarkable feature of their invention is, .that soft metals, when in a set state, being yet under heat ■ can be made, by extreme pressure, to reunite perfectly, around acore after a separation, and thus be formed into strong pipes or tubes.”
And “thaj; the essential difference in the. character of this pipe, distinguishing it from all others before made, was, that it was wrought under heat by pressure and constriction from set metal; and that it is not a casting formed in a mould.”
And they close by claiming, as their invention, “the combination described by them, when used to form pipes of metal under heat and pressure in the manner set forth.”
The Judge, in his charge, in commenting on the patent, states the invention to be substantially as above stated; and to this construction and view of the patent, no exception was taken by the defehdarits,
The court then proceed further to instruct the jury, and in dnswer to certain propositions submitted by the plaintiffs in error for the consideration of the court.
I. The first proposition laid down by the court,- is, that thé mere combination of machinéry, not new, in th («abstract, when combined with and applied to the practical development of a new principle, to produce a new and useful result, may be the subject'of a valid patent. This principle is repeated several times, in different connections, in the course of the charge to the jury; and as often excepted to by the counsel for the defendants.
The counsel for the defendants in error, insist that the above position is correct, and supported by principle, by precedent, and by. practice.
1. The position is supported by principle, founded on the statutes giving patents to inventors. He who discovers a new principle, and points o.ut the means of applying it, to produce a new and useful result, comes -within the settled construction of the English act, giving a patent for the sole working of any manner of new manufactures. See 6th section of the act 21 James 1, (1623.) By our patent law, ’ any person, having .invented- or discovered any new manufacture, &c., is' entitled to a patent. See 6th section of the act 4th July, 1836. The term new manufacture includes not only the thing produced, but the' means of producing it.
2. This principle, is supported by authority. Curtis, Pat. § 9. §§ 71 to 91; also chap. 2, pp. 57 to 94, and cases there cited Earl Dudley’s patent for the use of pea or pit coal, in the manufacture of iron. 1 Carpmael, 15; Webster’s Patent Cases, 14, S. C. — Nielson’s patent for the hot' air blast, in connection with common bituminous pit coal, in the manufacture of iron. 8 Mees. & Welsb. 806 to 825; A. D. 1841; Nielson v. Hartford, &c., Web. Pat. Ca. 295, 328, and 328 to 373; A. D. 1841; S. C. 374. — Crane’s patent for the hot air blast, in connection- with anthracite coal. • Crane’s patent, Web. Pat. Cas. 375; date 1836. Crane v. Price, &c.; Webs. Pat. Cas. 377, 393; A. D. 1842, S. C. 4 Mann. & Grang. 380; S. C. 43 Eng. Com. L. R. 301; S. C. 2d vol. Frank. J. for year 1851, p. 388; French, &c. v. Rogers, &c. 394 to 397, and cases there cited by the court. 6 Eng. Law and Equity Rep. 536, overruling 2 Carrington & Kirwan, cited vs. Leon. 43, 47, 52; Curtis, 81 a.; Webster, 229, note.
II. The second exception by the defendants’ counsel is to the charge of the court, in relation to Mr. Keller’s evidence.
It is difficult to see upon what ground this exception of the defendants to the charge of the "court is founded. After remarking upon the character and weight of the fact testified to, the tvhole is submitted to the jury for their decision.
III. The third exception taken to the charge of the court is found in the next two paragraphs on the same page, and relates" to' the reissued patent. The same is repeated in the call of the defendants, in their eleventh proposition, upon which they ask the court to instruct the jury.
The substance of the charge, as given in both instances, is, that the language in one patent was in some parts different from that in the other, but the meaning was substantially the same in both. That the reissued patent must be for the same invention as the first; and the matter of fact was left to the jury.
IV. The next exception is to the charge of the court, as found at the top of the 42d page of the case, and is as follows:
“ That in the patents referred to, from the year 1797 to 1832, the combination xvhich was claimed to be identical, was confessedly used for making pipe, by casting with fluid lead in a mould, and after it was set, by the application of water, forcing it out.
“ And the question is, whether any of these inventions are substantially the same as the plaintiffs’; whether, even, if by these modes, pipe had been successfully made for common use, it would have been made in the same manner as the Hansóns’; to -^rhich opinion, the counsel for the defendants excepted.”
Whether the modes referred to by the court, of manufacturing pipe, were the same or different, was a question of fact left to the jury; and the court did not, by the manner of stating the point, withdraw it from the consideration of the jury.
V The fifth exception relates to the charge of the court, as to the duty of the plaintiffs to put and keep the invention on sale on reasonable terms, and they say that it was not essential that the patentees should take active means for the purpose of putting their invention in market, and forcing a sale; but that they should at all times be ready to sell at a fair price, when a reasonable offer was made.
That it was for the jury to say whether it was put and continued on sale, under this view of the law — to which the counsel for the defendants excepted.
We insist that the court took a correct view of the statute, and prpperly submitted the question of fact to the jury; and that the exception is not well taken.
VI. The next exception in the order in which the defendar ts in error have noticed them, relates to the instructions of tue court, in relation to the liability of Le Roy and Smith jointly, with the other defendant, Lowber.
It seems, to the counsel for the defendants in error, that the question was properly submitted to the jury, as a question of fact, how far Le Roy and Smith had made themselves liable with Lowber. The defendants in error insist that the exception to this part of the charge is not well taken.
VII. In answer to the fourth proposition, on which the court was requested to instruct the jury that Tatham’s patent was void on its face, &c. We say that the charge of the court was correct. The patentees in Tatham’s patent have pointed out clearly what they claim, and what they do not claim.
VIII. In their ninth proposition, the defendants'requested the court to instruct the jury—
“That if they believed the same combination of cylinder, piston, bridge, short core, die, and chamber, under heat and pressure, had before been patented in England by Bramah, and published in a well known work, then the plaintiffs cannot recover.”
Upon this, proposition the court instructed the jury, inat Bramah’s patent and the Tathams’-were not identical; and declined to instruct the jury as requested. To which the counsel for the defendants excepted. This request by the defendants for the above instruction was based on the assumption of a fact not proved and not true, and was correctly refused.
IX. The defendants requested the court to instruct the jury according to-their tenth proposition, which is as follows — “That if the jury believe that the Burr, Bramah, Titus, and Hague machines, or either of them, were published to the world in well known public works, and. had the same combination, in whole or in part, as the Hanson machine, up to a certain point, the Tathams’ patent is void for claiming too much, viz., the whole* combination; and the court thereupon instructed the jury, hat they had explained their views on that part of the case, and declined to instruct them as requested in the form in which the proposition was stated.” To which the counsel for the defendants excepted, and the defendants in error insist that this exception is not well taken.
X. The sixteenth proposition, on which the court was requested to instruct the jury, is in the following words, namely,—
“ That the jury are the sole and exclusive judges as to the questions of fact, whether the combination and process were the same in the plaintiffs’ machine as was Bramah’s, or in any other of the machines proved on the trial. And thereupon the court instructed the jury, that this was so undoubtedly; subject, however, to the principles of law as laid down in the preceding charge and instructions.” To which the counsel for the defendants excepted.
The defendants in error insist'that none of the ex-ceptions aforesaid are well taken; and that said judgment should be affirmed, with costs and damages.

Opinion:
Mr. Justice McLEAN
delivered the opinion of the court.
This is a case on error, from the Circuit Court of the Southern District of New York.
The action was brought in the Circuit. Court, to recover damages for an alleged infringement of a patent for new and useful improvements in machinery for making pipes and tubes from metallic substances.
The declaration alleged that John and Charles Hanson, of England, were the inventors of the improvements specified, on or prior to the 31st of August, 1837 ; that on the 10th of January, 1840', the ITansons assigned to H. B. and B. Tatham, two of the defendants in error, the full and exclusive right to said improvements; that,- on the 29th of March, 1841, letters-patent were granted for the improvements to the Tathams, as the assignees of the Hansons; that, afterwards, H. B. and B. Tatham assigned to G. -N. Tatham, the remaining defendant in error, an undivided third part of the patent.
On the 14th of March, 1846, the said letters-patent were surrendered, on the ground that the specifications of the improvements claimed were defective, and - a new patent was 'issued, which granted to the patentees, their heirs, &c., for the term of fourteen years^ from the 31st of August, 1837, the exclusive right to make and vend the improvements secured. The declaration states, the patent was of the value of fifty thousand dollars; and that the defendants below had made and vended lead pipe to the amount of two thousand tons, in violation of the patent, and to the injury of the plaintiffs twenty thousand dollars.
The defendants pleaded not guilty; the defendant Lowber did not join in the plea, but permitted judgment to be entered against him by default. On the trial, certain bills of exceptions were taken to the instructions of the court to the jury, on which errors are assigned.
The schedule, which is annexed to the patent, and forms a part of it, states that the invention consists " in certain improvements upon, and additions to, the machinery used for manufacturing pipes and tubes from lead or tin, or an alloy of soft metals capable of being forced, by great pressure, from out of a receiver, through., or between apertures, dies, and cores, when in a set or solid state, set forth in the specification of a patent granted to Thomas Burr, of Shrewsbury, in Shropshire, England, dated the 11th of April, 1820." After describing Burr's machine, its defects, and. thé. improvements made on it as claimed,- the patentees say, " Pipes thus made are found to possess great solidity and unusual strength, and a fine uniformity of thickness and accuracy of bore is arrived at, such as, it is believed, has never before been attained by any other machinery."
" The essential difference in the character of this pipe, w iiich distinguishes it, as well as that contemplated by Thomas Burr, from all other heretofore known or attempted, is that it is wrought under heat, by -pressure and constriction, from set metal; and that it is not a casting formed in a mould."
And they declare, "We do not claim as our invention and improvement, any, of the parts of the above-described machinery, independently of its arrangement and combination above set forth. What we do claim as our invention, and desire to secure, is, the combination of the following parts above described, to wit: the core and bridge, or guide-piece, with the .cylinder, the piston, the chamber and the die, when used to form pipes of metal, under heat and pressure, in the manner set forth, or in any other manner substantially the same."
The plaintiffs gave in evidence certain agreements between the defendants, showing the manufacture of lead pipe by the defendant Lowber, for the defendants Le Roy and Smith. And also evidence tending to prove that the said John Hanson and Charles Hanson were the original and first inventors of the improvement described in the said letters-patent; that the invention and discovery.therein described was new and useful; that the lead pipe manufactured thereby, wag superior in quality and strength, capable of resisting much greater pressure, and more free from defects, than any pipe before made ; that in all the modes of making lead pipe, previously known and in use, it could be made only in short pieces, but that by this improved mode it'could be made of any required length, and also of any required size; and that the introduction of lead pipe, made in the mode described, had superseded the use of that made by any of the modes before in use, and that it was also furnished at a less price."
"And the. plaintiffs also gave evidence tending to prove that lead, when recently become set, and while under heat and extreme pressure in a close vessel, would reunite perfectly, after a separation of its parts; and that in the process described in the said patent^ lead pipe was manufactured by being thus separated and reunited; and that the said John and Charles Hanson were the first and original discoverers thereof; and that such discovery, and its reduction to a practical result in the mQde described in said letters-patent, was useful and important."
"And the plaintiffs also gave evidence, conducing to prove that the improvement, described in the letters-patent, was the same invention and discovery which had been made by the said John and Charles Hanson, and for which letters-patent had been granted to them in England, and subsequently in this country, to the Tathams, as recited in the letters-patent."
"And the plaintiffs also gave evidence conducing to pro've that they had been .ready and willing, and had offered to sell the said invention, within ' eighteen months succeeding .the-issuing of said letters-patent to'them, and also since; and had, within the said eighteen months, sold the same for a large portion of the United States."
The defendants' counsel then read in evidence from the •" Repertory of Arts," vol. 16, page 3-14, the description of the patent to the Hansons, dated August 31, 1837. They also read in evidence the patent issued upon the application of the plaintiffs to the Patent Office, containing another specification, which was annexed to the patent surrendered. And also they read the specification of Thomas Burr's patent, of April 11, 1820. Also a patent granted to ^.George W. Potter, described in the 12th "Franklin Journal of Arts," pubhshed in 1833; they also read the specification of a patent granted in England, to Bush and Harvey, on December 5th, 1817 ; and also the specification of a patent granted in England to Joseph Bramah, October 31st, 1797.
Evidence wa§ also given, to show that the combination of machinery for making lead pipe, described in public works as having been invented by Burroughs Titus, by-George W. Potter, by Jesse Fox, by John Hague, and by Joseph Bramah, were substantially the same as that used by the plaintiffs; that the combination of machinery, patented as herein before stated, by Bush- and Harvey, for making pipes of clay, and that used for making maccaroni, were substantially the same as that described in the plaintiffs' patent.
In their charge to the jury, the court said, " They, the plaintiffs, also state, that they do not claim any of the parts of the machinery, the cylinder, core, die, or bridge, but that they claimed the combination when used to form pipes of metal, under heat and pressure, in the way they have described. There can be no doubt that if this combination is new, and produces a new and useful result, it is the proper subject of a patent." " The result is a new manufacture. And even if the mere combination of machinery in the abstract is not new, still, if used and applied in connection with the practical development of a principle, newly discovered, producing ii'new and useful result, the subject is patentable. In this view, the improvement of the plaintiffs is the application of a combination of machinery to a new end; to the development and application of a new principle, resulting in a- new and useful manufacture. That the discovery of a new principle is not patentable, but it must be embodied and brought into operation by machinery, so as to produce a new and an useful result. Upon this view of the patent, it is an important question for the jury to determine, from the evidence, whether the fact is established, on which the alleged improvement is founded, that lead in a- set, or semi-solid state, can thus be reunited or welded, after separation." To this instruction the defendants excepted.
It was also objected, that the plaintiffs' patent was invalid for want of originality; that the invention had been before described in public works, and Bramah, Hague, Titus, Fox, and Potter^ were relied on by the defendants.
To this it was replied, by the court, " That in the view taken by the court in tlic construction of the patent, it was not material whether the mere combinations of machinery referred to were similar to the combination used by the Hansons, because the originality did not consist in the novelty of the machinery, but in bringing a newly discovered principle into practical application, by which a useful article of manufacture is produced, and wrought pipe made as distinguished from cast pipe." To this charge there was also an exception.
The word principle is used by elementary writers on patent subjects, and sometijnés in adjudications of courts, with such a want of precision in its application, as to mislead. It is ad mitted, that a principle is not patentable. A principle, in the abstract, is a fundamental truth ; an original cause; a motive ; these cannot be patented, as no one can claim in either of them an exclusive right. Nor can an exclusive right exist to a new power, should one be discovered in addition to those already known. Through the agency of machinery a new steam power may be said to have been generated. But no one can appropriate this power exclusively to himself, under the patent laws. The same may be said of electricity, and of any other power in nature, which is alike open to all, and may be applied to useful purposes by the use of machinery.
In all such cases, the processes used to extract, modify, and concentrate natural agencies, constitute the invention. The elements of the power exist; the invention is not in discovering them, but in applying them to useful-objects. Whether the machinery used be novel, or consist of a new combination of parts known, the right of the inventor is secured against all who use the same mechanical power, or one that shall be substantially the same.
A patent is not good' for an effect, or the result of a certain process, as that would prohibit all other persons from making the same thing by any means -whatsoever. This, by creating monopolies, would discourage arts and manufactures, against the avowed policy of the patent laws.
A new property discovered in matter, when practically applied, in the construction of a useful article of commerce of manufacture, is patentable ; but the process through which the new property is developed and applied, must be stated, with such precision as to enable an ordinary mechanic to construct and apply the necessary process. This is required by"the patent laws of England and of'the United States, in order that when the patent shall run out, the public may know how to profit by' the invention. ' It is said, in the case of the Househill Company v. Neilson, Webster's Patent Cases, 683, "A patent will be good, though the subject of the patent consists in the-discovery of a great, general, and most comprehensive principle in science or law'of nature, if that principle is by the specification applied to any special purpose, so - as thereby to effectuate a practical result anil benefit not previously attained." In that case, Mr. Justice Clerk, in his charge to the jury, said, " the specification does not claim any thing as to the form, nature, shape, materials, numbers,.or mathematical character of the vessel or vessels in which the air is to be hea'ed, or as to the mode of heating such vessels," &c. The patent was for " the improved application off air to produce heat in fires, forges and furnaces, where bellows or other blowing apparatus arc required."
In that case, although the machinery was not claimed as a part of the invention, the jury were instructed to inquire, " whether the specification was not such as to enable workmen of ordinary skill to make machinery or apparatus capable of producing the effect set forth in said letters-patent and specification." And, that in order to ascertain whether the defendants had infringed the patent, the jury should inquire whether they, " did by themselves or others, and in contravention of the privileges conferred by the said letters-patent, use machinery or apparatus substantially the same with the machinery or apparatus described in the plaintiffs' specification, and to the effect set forth in said letters-patent and specification." So it would seem that where a patent is obtained, without a claim to the invention of the machinery, through which a valuable result is produced, a precise specification is required; and the test of infringement is, whether the defendants have used substantially the same process to produce the same result.
In the case before us, the court instructed the jury that the invention did not consist " in the novelty of the machinery, but in bringing a newly discovered principle into practical application, by which a useful article of manufacture is produced, and wrought pipe made as distinguished from cast pipe."
A patent for leaden pipes would not be good, as it would be for an effect, and would, consequently, prohibit all other persons from using the same article, however manufactured. Leaden pipes are the same, the metal being in no respect different. Any difference in form and strength must "arise from the mode of manufacturing the pipes. The new property in the metal claimed to have been discovered by the patentees, belongs to the process of manufacture, and not to the thing made.
But we must look to the claim of the invention stated in their application by the patentees. They say, " We do not claim as our invention and improvement any of the parts of the above described machinery, independently of their arrangement and combina-1 on above set forth." " What we claim as our invention, ana desire to secure by letters-patent, is, the combination of the following parts above described, to wit, the core and bridge or guide-piece, the chamber, and the die, when used to form pipes of metal, under heat and pressure, in the manner set forth, or in. any other manner substantially the same."
The patentees have founded their claim on this specification, and they can neither modify nor abandon it in whole or in part. The combination of the machinery is claimed, through which the new property of lead was developed, as a part of the process in the structure of the pipes. But the jury were instructed, "that the originality of the invention did not consist in, the novelty of the machinery, but in bringing a newly discovered principle into practical application." The patentees claimed the combination of the machinery as their invention in part, and no such claim can be sustained without establishing its novelty — not as to the parts of which it is composed, but as to the combination. The question whether the newly developed property of lead, used in the formation of pipes, might have been patented, if claimed as developed, without the invention of machinery, was not in the case.
In the case of Bean v. Smallwood, 2 Story, R. 408, Mr. Justice Story said, " He (the patentee) says that the same apparatus, stated in this last claim, has been long in use, and applied, if not to chairs, at least in other machines, to purposes of.a similar nature. If this be so, then the invention is not now, but at most is an old invention, or apparatus, or machinery applied to a new purpose. Now I take it to be clear, that a machine, or apparatus, or other mechanical contrivance, in order to give the party a claim to a patent therefor, must in itself be substantially new. If it is old and well known, and applied only to a new purpose, that does not make it patentable."
We think there was error in the above instruction, that the novelty of the combination of the machinery, specifically claimed by the patentees as their invention, was not a material fact for the jury, and that on that ground, the judgment must be reversed. The other rulings of the court excepted to, we shall not examine, as they are substantially correct.
- Mr. Justice Nelson, Mr. Justice Wayne, and Mr. Justice Grier dissented.