Source: https://supreme.justia.com/cases/federal/us/261/45/
Timestamp: 2019-04-22 10:54:00+00:00

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Justia › US Law › US Case Law › US Supreme Court › Volume 261 › Eibel Process Co. v. Minnesota & Ontario Paper Co.
1. The Eibel patent, No. 845,224, for an improvement on Fourdrinier papermaking machines, whereby, mainly through a substantial elevation of the breast-roll end of the moving screen or "papermaking wire," the liquid stock discharged upon the screen acquires, through gravity, an additional speed, enabling it to keep pace with the screen at the critical paper-forming point, thus avoiding injurious disturbances of the stock when the screen moves very rapidly, and making possible a much speedier production of good paper than was theretofore obtained from the machines without the improvement held a new and useful invention. P. 261 U. S. 52.
2. The prompt and general adoption of the improvement, with increased productivity of the machines to which it was applied, is strong evidence of its novelty and usefulness. P. 261 U. S. 56.
3. Previous adoption of a comparatively slight pitch of the screen, but for another and distinct purpose, did not constitute anticipation of this invention. P. 261 U. S. 58.
4. Oral evidence of prior discovery must be clear and satisfactory to sustain an attack on a patent. P. 261 U. S. 60.
5. A patent for a very meritorious improvement on an old machine, substantially advancing the ar, is entitled to a liberal construction. P. 261 U. S. 63.
6. In this case, the patent is construed to cover a Fourdrinier machine in which the pitch of the wire screen is used not as the sole, but as an appreciable, factor in addition to those already present in bringing about approximate equal velocity of stock and screen at the point where otherwise injurious disturbances of the stock would be produced. P. 261 U. S. 65.
7. General descriptive terms in a patent are not objectionable where it would have been difficult to make them more specific and where the description is sufficient to enable those skilled in the art to apply the invention. P. 261 U. S. 65.
8. Accidental results, not appreciated, will not constitute anticipation. P. 261 U. S. 66.
9. An increased elevation in the pitch of an element in a machine beyond that previously employed for another purpose is not mere matter of degree, but amounts to invention when applied successfully to remedy an old defect in connection with the discovery of its cause. P. 261 U. S. 66.
10. The novelty of an invention is not impeached by the fact that the same results may be achieved in a different way. P. 261 U. S. 69.
11. The patent in this case, Claims 1, 2, 3, 7, 8 and 12, were infringed by defendants. P. 261 U. S. 69.
12. The first five of these are claims for a machine, and not a process. P. 261 U. S. 71.
"it has for its object to construct and arrange the machine whereby it may be run at a very much higher speed than heretofore and produce a more uniform sheet of paper which is strong, even, and well formed."
F. 847. On appeal, the Circuit Court of Appeals for the First Circuit reversed the decree and directed the dismissal of the bill, 274 F. 540 (1921). Because of the conflict in the two circuits, certiorari was granted to review the latter decree.
The Fourdrinier machine has for many years been well known and most widely used for making news print paper. Its main feature is an endless wire cloth sieve passed over a series of rolls at a constant speed. The sieve, known as the "wire," is woven with 60 or 70 meshes to the inch. It may be 70 feet or more in length, and is often more than 100 inches in width. Its working surface, with the total length of 70 feet, is about 30 feet; the rest being taken up in the return of the wire underneath. At what is called the "breast roll," at one end of the machine, there is discharged upon the wire, from a flow box or pond, a constant stream of papermaking stock of fibers of wood pulp mixed with from 135 to 200 times their weight of water of the consistency and fluidity of diluted milk. As this stream moves along the wire, the water drains through its meshes and the fibers are deposited thereon. The process is stimulated by a device to shake the wire with constant and rapid sidewise thrusts, forward and back, which insures the proper interlocking and felting of the stock as it progresses, the water continuing to drain from it. At the end of the surface length of the wire, the stock reaches what are called the "couch rolls," between which it is pressed, and then, in the form of a sheet of uniformly distributed pulp, felted sufficiently to hold together, it leaves the wire and is carried through a series of rolls or calendars by which the sheet is pressed and dried, and from which it emerges to be rolled up as finished paper.
is given the opportunity to flow upon the wire. The stream thus issuing is given a width of the desired sheet of paper and a depth regulated by the height to which the slice is lifted. The stream on the wire is prevented from flowing off the sides by "deckle straps," which are thick rubber bands, resting on each side of the wire at each side of the pulp. Traveling with the wire, they form lateral walls confining the stock till it is too dry to flow. Between the breast roll, where the stream of liquid stock strikes the wire, and the couch rolls at the end of the surface length of the wire, there is a series of parallel horizontal rolls supporting the wire, called table rolls, and 20 feet from the breast roll there are placed, under the wire and in contact with it, three suction boxes in succession, in which a partial vacuum is maintained, and through them is sucked out the greater part of the water remaining in the wet sheet of the pulp. Placed above the wire and just beyond the first suction box is what is called the "dandy roll," which is faced with wire cloth. Its office is to impress the upper surface of the forming sheet of paper and give it a texture similar to that which the lower surface of the paper has from its contact with the wire. It may also carry the design which is to give the watermark to the sheet, if such a mark is desired. Beyond this is a larger roll, called the "guide roll," arranged with an automatic device varying its axis, so as to keep the wire straight. From the guide roll, the wire drops below the plane to the couch rolls, already referred to.
These machines are very large, some of them weighing more than 1,000,000 pounds, and their cost will range as high as $125,000. They are run night and day, in order that the capital invested in them may yield a proper return. Speed, which increases production, is therefore of the highest importance. Eibel's patent had for its avowed purpose of increase of this speed.
"My invention is embodied essentially in the first part or element of the machine having the Fourdrinier wire or papermaking wire, and consists in causing the stock to travel by gravity in the direction of movement of the making wire and approximately as fast as the making wire moves, thereby resulting in a 'gravity feed' for the machine. The stock may be and preferably is caused to travel more rapidly than the normal or usual speed of the making wire for a certain grade of stock, and means are provided for increasing the speed of the machine so as to cause the making wire to move at a higher rate of speed than usual, being substantially equal to the speed of the rapidly moving stock. To accomplish this result in a simple manner, the breast roll end of the papermaking wire is maintained at a substantial elevation above the level, thereby providing a continuous downwardly moving papermaking wire, and the declination thus given to the wire is such that the stock is caused to travel by gravity in the direction of the movement of the wire and substantially as fast as the wire moves. The declination of the papermaking wire may be adjustable, or the speed of the wire may be variable, or both the declination and speed of the wire may be adjustable, in order that the velocity produced by gravity in the stock on the declining wire will approximately equal the speed of the wire. By this arrangement, the speed of the machine may be increased to such an extent as to bring the speed of the making wire up to the maximum velocity of the rapidly moving stock and a strong, even, and well formed sheet produced which is more uniform than usual."
the breast roll and wire from the horizontal. The outline shows an elevation of the breast roll and wire, so that the angle between the wire and the horizontal at the guide roll is about 4 percent, which, in a surface length of 30 feet would mean an elevation of 12 inches at the breast roll. The other figure, No. 2, shows a device for regulating the speed of the wire applied at the lower couch roll.
"For the purpose of increasing the speed of the machine to the maximum, I maintain the breast roll end of the making wire at a high elevation above the level, so that the stock travels by gravity much faster than the making wire ordinarily runs for a certain grade of stock, and I then increase the speed of the machine to such extent as to bring the rate of speed of the making wire up to the speed of the rapidly moving stock, and, as a result, the capacity of the machine is largely increased."
"I find in practice that, by providing a gravity feed operating substantially as herein described, the stock runs smoothly and evenly without waving or rippling, and the fibers are thereby permitted to settle with great uniformity as regards their distribution over the wire, so that the paper, in addition to being well formed, is very uniform. Furthermore, as the stock is moving with the papermaking wire, instead of being moved by the wire, or essentially by the wire, the formation of the paper will begin at the start, and will continue to the end of the travel of the stock with the wire."
1. A Fourdrinier machine having the breast roll end of the papermaking wire maintained at a substantial elevation above the level, whereby the stock is caused to travel by gravity, rapidly in the direction of movement of the wire, and at a speed approximately equal to the speed of the wire, substantially as described.
whereby the stock is caused to travel by gravity faster than the normal speed of the wire for a certain grade of stock, and having means for increasing the speed of the machine to cause the wire to travel at substantially the same rate of speed as the rapidly moving stock, substantially as described.
3. A Fourdrinier machine having the papermaking wire declined from the breast roll to the guide roll, the breast roll end of the wire being maintained at a substantial elevation above the level, whereby the stock is caused to travel by gravity, rapidly, in the direction of movement of the wire and at a speed approximately equal to the speed of the wire, substantially as described.
7. A Fourdrinier machine having the papermaking wire declined from the breast roll to the guide roll, and the suction boxes supported at a corresponding declination, substantially as described.
8. A Fourdrinier machine having the papermaking wire declined from the breast roll to the guide roll, and the several suction boxes arranged at different elevations, substantially as described.
12. In a Fourdrinier machine, a downwardly moving papermaking wire, the declination and speed of which are so regulated that the velocity of the stock down the declining wire, caused by gravity, is so related to the velocity of the wire in the same direction, that waves and ripples on the stock are substantially avoided and the fibers deposited with substantial uniformity on the wire, substantially as described.
The evidence in the case establishes that, before Eibel entered the field, continued high speeds in the wire of the Fourdrinier machine much beyond 500 feet a minute resulted in defective paper. Eibel concluded that this was due to the disturbance and ripples in the stock as it was forming at a point between the breast roll and the first suction box, caused by the fact that, at that point, the wire was traveling much faster than the stock, and that if, at that point, the speed of the flowing stock could be increased approximately to the speed of the wire, the disturbance and rippling in the stock would cease, and the defects would disappear from the paper product. Accordingly, he proposed to add to the former speed of the stock by substantially tilting up the wire and giving the stock the added force of the down hill flow. He thought that, as long as he could thus maintain equality of speed between stock and wire at the crucial point, and prevent the disturbance and rippling there, a further increase in the speed of the wire would not result in a defective product. He confirmed this by actual trial.
The first and most important question is whether this was a real discovery of merit. The circuit court of appeals thought not. The prior art and the obvious application of the principle that water will run down hill in their opinion robbed it of novelty or discovery. The issue is one largely of evidence.
validity of the patent would impose a royalty on many of the paper manufacturers of the country who were not already licensees of the plaintiff led to the defendant's sending a circular letter to awaken the interest and secure the help of all so situated. This, as the record shows, had the effect to invoke offers of testimony on the critical points in the case from the unlicensed part of the trade. The plaintiff introduced a few witnesses in rebuttal as to particular details and the same expert as in chief. The plaintiff's case, as presented on the record, is largely the presumption of validity and novelty attaching to the patent and such evidence as comes from defendants' witnesses. A case that can be made out in all its elements by cross-examination of opposing witnesses is a strong case. Implication of facts and conditions falling from the mouths of witnesses when only collateral to the exact point of inquiry for which they are called is generally the most trustworthy evidence because the result of the natural, so to say, subconscious adherence to truth uninfluenced by a knowledge or perception of the bearing of the implication on the ultimate issue in the case.
of his discovery, adopted his pitch and increased their product.
What Eibel tried to do was to enable the papermaker to go to 600 or 700 feet and above in speed and retain a good product. Did he do it? Eibel was the superintendent of a paper mill at Rhinelander, Wisconsin. Before August, 1906, he raised the pitch of the wire from 2 or 3 inches to 12 inches, and greatly increased the speed, with a satisfactory product, and in that month he applied for a patent. The defendant's witnesses without exception refer to that disclosure as something that surprised and startled the papermaking trade. It spread, to use the expression of one witness, like wildfire. There were those who hesitated to take the venturesome step to give such an unheard-of pitch to the wire, and waited until others assumed the risk, but the evidence is overwhelming that, within a short interval of a year or two, all of the fast machines were run with wires at a pitch of 12 inches and that this pitch has been increased to 15 and 18 and even 24 inches; that the speed of the machines with satisfactory product has increased to 600, 650, and even 700 feet, with plans now even for 1,000 feet, and that the makers of two-thirds of the print paper of the country are licensees of Eibel.
to a fund to help in resisting the establishment of the right of Eibel to claim a royalty for the use of this high or substantial pitch of the wire in the making of paper. Presumably they, too, find it wise to use the Eibel pitch. The papermakers in this country who do not use the Eibel pitch therefore are few. It can hardly be that dividends on the shares of stock in the Eibel Company held by the five large companies would furnish motive enough for them to continue to be licensees, and to use something that was not of great advantage to them in their chief business of making of paper, and certainly no such motive would explain the action of the licensees, who are not stockholders, or that of the infringers, in continuing to use the Eibel pitch. It should be said that one of the large manufacturers of papermaking machinery called by the defendant said that, since 1907, he had not installed a single machine without the Eibel pitch.
The fact that the Eibel pitch has thus been generally adopted in the papermaking business, and that the daily product in papermaking has thus been increased at least 20 percent over that which had been achieved before Eibel, is very weighty evidence to sustain the presumption from his patent that what he discovered and invented was new and useful. Of course, although very persuasive, it is not conclusive, and may be explained. This brings us to the consideration of the evidence of the prior art, and the contention of the defendant and the conclusion of the court below that the step taken by Eibel, so far as he took one, was a mere obvious application of fully developed devices in the prior art.
stock -- as, for instance, with quick stock and slow stock; but, so far as I am aware, the making wire has always had to perform the work of drawing along the stock, and, as the wire moved much faster than the stock, the stock waved or rippled badly near the breast roll end of the wire, which gradually diminished until an equilibrium was established, and a smooth, even, glassy surface presented, and not until the waving or rippling ceased did the fibers lay down uniformly and produce a well formed sheet of paper. The machine has been run necessarily at a slow rate of speed to give ample time for the water to escape and for the fibers to lay down, so as to make a uniform sheet, and, in case the time was insufficient, the breast roll end of the wire has been lowered still further until the desired result was accomplished. In accordance with my invention, I operate entirely above the level, to cause the stock to travel by gravity at a velocity approximately equal to the speed of the making wire, which I believe to be a new principle of operation."
"In certain kinds of pulp, notably the wood pulp which is now largely used in making paper, the water drains away very rapidly, so that the pulp may become nearly dry before it leaves the shake frame, and thus not be properly laid when it reaches the rollers. This tendency may be obviated to a considerable extent by downwardly inclining the shake frame toward the rollers, so that the water tends to travel along with the pulp, and will not therefore drain out through the wire so rapidly. It is further desirable that the amount of inclination or slope should be variable, so as to adapt the machine for pulp of different kinds or grades."
progress that now seems so easy and clear to everyone. There was, too, always indefiniteness as to when such increase in elevation of the wire had taken place, whether before or after August, 1906, Eibel's date, and there was no evidence of weight, we think, after a full examination of the record, sufficient to justify a finding that such elevations had ever exceeded three inches before his application.
offset by the reversal of his decree in the circuit court of appeals, because that court seems to have reached its conclusion chiefly on other grounds yet to be considered.
The defendant's counsel contend that the specifications of the Eibel patent require that the only force to be used in giving speed to the stock shall be the force of gravity created by the angle of downhill inclination of the wire. They say that the patentee mentions no other means of acceleration, that he must be confined to this, and that a machine which uses other factors for this purpose does not infringe. We do not understand the circuit court of appeals to go quite so far, but it does seem to give a construction requiring the force of gravity caused by the pitch of the wire to be the predominating cause of the increased speed of the stock. The factors of speed of the stock in such a machine, before the factor of pitch was applied to increase it, were the head or hydraulic pressure of the stock in the flow box behind the slice, imparting movement to it as it came out onto the wire under the lifted slice, and the carrying effect of the moving wire upon the fluid stock as it fell upon the wire and proceeded gradually to form into a web as the fibers were laid and the water drained.
speed to the stock, and, in its unformed fluidity, the added speed does not disturb or ripple the stock to the injury of the process of papermaking. It is only after the stock proceeds a third or a half of the surface length of the wire that the point is reached where the overspeed of the drag becomes troublesome in the felting or formation of the web of the pulp. Before that point is reached, the "drag" may be useful in bringing the speed of the stock nearer to that of the wire without injury. The truth seems to be, and this is brought out with force in the testimony of the defendant's expert witness Livermore, that, while it is possible to calculate to a nicety the velocity of the free flowing liquid stock due to head and pitch when unaffected by drainage, variation in viscosity and fluidity, and the like, yet, when these conditions are present, as they always are, and the other less calculable factor of the drag of the wire enters the problem, there is no means, short of actual experiment, to enable one to anticipate results, and it is quite impossible to apportion to each factor its real influence. This fact reflects on the question whether Eibel's discovery was invention, rather than the mere obvious and simple application of known natural forces.
The defendant introduced expert evidence to show that, with a head of 2 1/4 inches in the flow box and a speed of 585 feet to the minute in the wire, and excluding the factor of "drag" of the wire, it would require an elevation of 48 inches to make up the difference in speed of the stock given by the head and the speed of the wire at a distance ten feet from the point of discharge on the wire. The conclusion drawn from this seems to be that, as no practical machine uses 48 inches pitch, the Eibel invention has never been used or infringed. Disregarding its error in omitting necessary factors already adverted to, this reasoning seems to us to depend on too narrow a construction of the patent.
In administering the patent law, the court first looks into the art to find what the real merit of the alleged discovery or invention is and whether it has advanced the art substantially. If it has done so, then the court is liberal in its construction of the patent, to secure to the inventor the reward he deserves. If what he has done works only a slight step forward, and that which he says is a discovery is on the borderline between mere mechanical change and real invention, then his patent, if sustained, will be given a narrow scope, and infringement will be found only in approximate copies of the new device. It is this differing attitude of the courts toward genuine discoveries and slight improvements that reconciles the sometimes apparently conflicting instances of construing specifications and the finding of equivalents in alleged infringements. In the case before us, for the reasons we have already reviewed, we think that Eibel made a very useful discovery, which has substantially advanced the art. His was not a pioneer patent creating a new art, but a patent which is only an improvement on an old machine may be very meritorious, and entitled to liberal treatment. Indeed, when one notes the crude working of machines of famous pioneer inventions and discoveries, and compares them with the modern machines and processes exemplifying the principle of the pioneer discovery, one hesitates in the division of credit between the original inventor and the improvers, and certainly finds no reason to withhold from the really meritorious improver the application of the rule "ut res magis valeat quam pereat" which has been sustained in so many cases in this Court. Winans v. Denmead, 15 How. 338, 56 U. S. 341; Corning v. Burden, 15 How. 265, 56 U. S. 269; Turrill v. Railroad Co., 1 Wall. 491, 68 U. S. 510; Rubber Co. v. Goodyear, 9 Wall. 788, 76 U. S. 795; McClain v. Ortmayer, 141 U. S. 419, 141 U. S. 425.
"For the purpose of increasing the speed of the machine to the maximum, I maintain the breast roll end of the making wire at a high elevation above the level, so that the stock travels by gravity much faster than the making wire ordinarily runs for a certain grade of stock, and I then increase the speed of the machine to such an extent as to bring the rate of the making wire up to the speed of the rapidly moving stock, and, as a result, the capacity of the machine is largely increased."
"The process invented by him [Eibel] begins to operate after the stock has entered upon the wire. His apparent attempt was to get rid of bubbles and wrinkles before he got to the place on the machine where the paper is formed. To do this, he allowed gravity to work with 'drag' and with 'head.' He harnessed all the elements he could find. He brought gravity in with the other elements, and so brought the speed of the stock up to equality with that of the wire. By this means, he achieved high speed and also freed the stock on the wire from waves and ripples."
force acquired by the pitch of the wire, and that he called gravity, and Judge Hale, in the passage quoted, uses the word with the same meaning, and without any confusion to the reader.
We think, then, that the Eibel patent is to be construed to cover a Fourdrinier machine in which the pitch of the wire is used as an appreciable factor, in addition to the factors of speed theretofore known in the machine, in bringing about an approximation to the equal velocity of the stock and the wire at the point where, but for such approximation, the injurious disturbance and ripples of the stock would be produced.
when his attention was called to their importance, in fixing the place of the disturbance and ripples to be removed or in determining what was the substantial pitch needed to equalize the speeds of the stock and wire at that place. The immediate and successful use of the pitch for this purpose by the owners of the then fastest machines and by the whole trade is convincing proof that one versed in papermaking could find in Eibel's specifications all he needed to know to avail himself of the invention. Expressions quite as indefinite as "high" and "substantial" in describing an invention or discovery in patent specifications and claims have been recognized by this Court as sufficient. In Tilghman v. Proctor, 102 U. S. 707, the claim sustained was for "the manufacturing of fat acids and glycerine from fatty bodies by the action of water at a high temperature and pressure." See also Rubber Co. v. Goodyear, 9 Wall. 788, 76 U. S. 794; Mowry v. Whitney, 14 Wall. 620, 81 U. S. 629; Lawther v. Hamilton, 124 U. S. 1, 124 U. S. 9; Carnegie Steel Co. v. Cambria Iron Co., 185 U. S. 403, 185 U. S. 436; Abercrombie & Fitch Co. v. Baldwin, 245 U. S. 198, 245 U. S. 205.
It is contended on behalf of the defendant that, whether Barrett and Horne perceived the advantage of speeding up the stock to an equality with the wire, yet the necessary effect of their devices was to achieve that result, and therefore their machine anticipated Eibel. In the first place, we find no evidence that any pitch of the wire, used before Eibel, had brought about such a result as that sought by him, and, in the second place, if it had done so under unusual conditions, accidental results, not intended and not appreciated, do not constitute anticipation. Tilghman v. Proctor, 102 U. S. 707, 102 U. S. 711; Pittsburgh Reduction Co. v. Cowles Electric Co., 55 F. 301, 307; Andrews v. Carman, 13 Blatchford, 307, 323, Fed.Cas. No. 371.
"I should say not. It looks to me as if Barrett and Horne referred to the adjustment of inclination with one effect in mind, and that Eibel referred to like adjustment with another effect in mind. . . . In this particular case, the two effects have, so far as I can see, no special correlation to one another, and an adjustment made with one effect in mind might or might not produce a desirable effect as to the other function or phenomenon."
they were due to the unequal speeds of stock and wire at that point and could be removed by equalizing the speeds. The invention was not the mere use of a high or substantial pitch to remedy a known source of trouble. It was the discovery of the source not before known, and the application of the remedy, for which Eibel was entitled to be rewarded in his patent. Had the trouble which Eibel sought to remedy been the well known difficulty of too great wetness or dryness of the web at the dandy roll, and had he found that a higher, rather than a lower, pitch would do that work better, a patent for this improvement might well have been attacked on the ground that he was seeking monopoly for a mere matter of degree. But that is not this case. On the other hand, if all knew that the source of the trouble Eibel was seeking to remedy was where he found it to be, and also knew that increased speed of the stock would remedy it, doubtless it would not have been invention on his part to use the pitch of the wire to increase the speed of the stock when such pitch had been used before to do the same thing, although for a different purpose and in less degree. We cannot agree with the circuit court of appeals that the causal connection between the unequal speeds of the stock and the wire, and the disturbance and rippling of the stock, and between the latter and the defective quality of the paper in high speeds of the machine, was so obvious that perception of it did not involve discovery which will support a patent. The fact that, in a decade of an eager quest for higher speeds, this important chain of circumstances had escaped observation, the fact that no one had applied a remedy for the consequent trouble until Eibel, and the final fact that, when he made known his discovery, all adopted his remedy, leave no doubt in our minds that what he saw and did was not obvious, and involve discovery and invention.
of a new factor in the solution of the problem, because the same result would have followed if the head of the flow box had been made greater, in order increase by gravity the speed of the stock. Doubtless this could have been done. There were difficulties, however, in such a method when Eibel's application was filed, because, in the then machines, the flow box as supported by an apron over the wire, and the necessary addition to the weight of the stock in the flow box, in increasing the head would have interfered with the free working of the wire. Since that time, an improvement has been adopted by which the flow box does not rest on the wire, and additional head can be imparted to the stock. The defendant invites attention to the fact that one or two papermakers are increasing this head and giving up the pitch for the purpose of increasing the speed of the stock. We do not see that these circumstances in any way affect the validity of the Eibel patent. If defendant or others can do what Eibel accomplished in another way, and by means he did not include in his specifications and claims, i.e., by additional head and the abandonment of a substantial pitch, they are at liberty to do so and avoid infringement.
"having the breast roll end of the papermaking wire maintained at a high elevation, whereby the stock is caused to travel by gravity faster than the normal speed of the wire for a certain grade of stock, and having means for increasing the speed of the machine to cause the wire to travel at substantially the same rate of speed as the rapidly moving stock, substantially as described."
The same thing is true of the third claim.
Question has been made whether these three claims are for a machine or a process. We think they are claims for a machine -- i.e., for an improvement on a machine -- and that the devices for such improvement, to-wit, the elevation by a screw or other equivalent method, and the control of the speed of the wire, are shown by the specifications and the figures, together with a sufficient description of their operation.
The seventh and eighth claims are for the same improvement, with the suction boxes changed from their usual position in the unimproved machine to make them effectively function on the pitched wire. They are machine claims, and are infringed by the defendant. Their new adjustment is part of a new combination, and the words "substantially as described" limit them to a combination including the elements included in the first three claims.
velocity of the wire in the same direction that waves and ripples on the stock are substantially avoided and the fibers deposited with substantial uniformity on the wire, substantially as described."
This comes nearer to being a process claim, but, whether it is or not, the defendant infringes it.
The evidence discloses that, after the suit was brought, the defendant reduced the pitch of one of its machines to 6 inches, and the contention of defendant is that the machine ran as well and gave as good results as when its pitch was 15 inches. We are not called upon to decide whether this contention can be sustained, because the reduction was after the bill was filed. It may be noted, however, that the admissions of witnesses seem to show that this reduction was made for purposes of the suit, and that, immediately after the defendant won the suit in the circuit court of appeals, it restored the pitch of this machine to 15 inches, and, when the decree of the circuit court of appeals proved not to be final, the wire was lowered again to a 6-inch pitch. Much evidence was taken, and much discussion has followed, upon the point whether a 6-inch pitch, accomplishing in whole or in part what Eibel sought to do, would infringe a patent for a substantial pitch. We do not find it necessary to pass definitely on the question, because it is not before us on the record, though we cannot prevent the natural inferences upon this point to be drawn from the conclusions we have reached.
The decree of the circuit court of appeals dismissing the bill is reversed, and the decree of the district court is affirmed.
* It is true that defendant's expert, Carter, points out that, in some of the machines of the prior art in which means were provided for tilting up the wire, the tilting was confined to that part of the surface length covered by the shake frame, say 18 feet, and did not extend to the first suction box, whereas Eibel's tilting involved the entire surface length of 30 feet. It would follow from this that the elevation of 3 inches in such machines would mean a greater angle of declination than 3 inches for the full surface length, and that the disparity between 3 inches and 12 inches was not so great as the figures would lead one to think. But, whatever difference this might make, the fact remains that Eibel's pitch was substantially greater than anything in the prior art.

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