# Hoff v. Iron-Clad Manufacturing Company/Opinion of the Court

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* Case Syllabus
* Opinion of the Court
United States Supreme Court
139 U.S. 326
Hoff v. Iron-Clad Manufacturing Company
The essence of the Hoff patent consists in his method of manufacture, by taking a blank sheet of metal of the proper size and shape, folding it in the for of a cone, and then crimping the smaller end to form the bottom, which is thus made much thicker and more durable than the sides. The bottom shown in his drawings is composed of a series of concentric rings, but he states in his specifications that he does not desire to limit himself to any particular form of crimp or fold for the bottom of the hod, since it is evident that the form of the fold may be changed and still have the tapering end of the blank compressed to force the surplus metal to fold over and strengthen the bottom, and it is also evident that the blank may be varied to suit different shapes of hods.
To ascertain the exact scope of this patent it is necessary to examine the state of the art at the time it was issued. The crimping or doubling in of the ends of paper packages has, of course, been a common practice from time immemorial. The patent to George Smith, No. 124,093, issued February 27, 1872, exhibits a coal-hod in the shape of an inverted hollow cone, the apex of the cone being the bottom and center of the hod. It differs from any ordinary coal-hod only in dispensing with the ordinary horizontal bottom, and contains no suggestion of the crimping process, which is the main feature of the Hoff patent hod, although a method is suggested of repairing the bottom of the hod by the substitution of a new cone, which constitutes the chief feature of the invention.
The patent to Edward F. O'Toole, May 22, 1877, No. 191,071, exhibits a coal-hod formed of a blank piece of metal, forced into a series of vertical crimps upon both sides of the hold. The crimps begin at the bottom of the hod, and widen towards the top. The bottom, however, is rectangular, and composed of a single sheet of metal, so that the hold is really the weakest at the part which is subjected to the greatest wear.
Patent No. 199,370, of January 22, 1878, to Isaac F. Kearns, relates to a method of strengthening or re-enforcing those parts of tin vessels most subject to wear and strain, in forming upon the bottom of the vessel a fold, which is bent up against the bottom until it is flat, so that at the fold there are three thicknesses of metal in close contact to resist wear at this exposed point. After being thus provided with the flattened fold the vessel is retinned, so that the crevices on the inside and outside are closed, and water excluded from the fold. This, though evidently for a bottom-forming process, contains but a faint suggestion of the patent in suit,-both the process of manufacture and the result being entirely different from those shown in plaintiff's patent.
The patent to Clark and Wells, No. 221,522, of November 11, 1879, for an improvement in metallic baskets, exhibits a body made of a rectangular blank or piece of sheet metal, which is bent in cylindrical form, with the ends of the sheet metal overlapping each other and riveted, while the metal is straight. The corrugations are made broad and shallow at their upperends, near the top of the backet, and then gradually decrease in width and increase in depth towards the bottom. It is somewhat similar in principle to the O'Toole patent, and, like that, differs from the plaintiff's in failing to provide for an increased thickness for the bottom, which is an ordinary one and secured to the body by the usual seaming process.
The English patent to George Hazeltine, of December 19, 1873, is for 'improvements in cylindrical and other boxes, cases, cans, and similar vessels, and in apparatus for the manufacture of the same.' While many of the articles enumerated in his patent are evidently contemplated to be made of paper or pasteboard he expressly describes his product as consisting 'of a box or other vessel of any suitable material, when constructed by folding, crimping, swaging, or compressing,' and the use of the mandril, punch, and die in the formation of his boxes indicates that he is dealing with substances not easily flexible. The result is a box of any suitable material made by crimping or old ing a portion of a previously prepared tube or hollow cylinder in such a manner as to form the closed end thereof, or, as described in his sixth claim, 'an oval box formed from a tube or hollow cylinder, when the bottom of the same is made by folding or crimping in a portion of the body thereof.' Even if the only material contemplated by Hazeltine were pasteboard, the adaptation of the same method of manufacture to a stiff material like zinc or sheet-iron would not necessarily involve invention, so long as the process of manufacture is practically the same. His results are practically the same as those obtained by the Hoff patent, except that it would appear from the Hazeltine drawings that he did not contemplate that the entire bottom of the box should be formed of the crimped materials, but that the center should be made of another piece of metal, over which the ends of the side pieces are crimped to form a solid bottom. The exhibit 'Old Zinc Cylinder' is an application of the Hazeltine idea to the formation of a metallic cylinder for holding a roll of sheet zinc, and consists of a metal case or body, in which the ends or bottoms are formed in part of the same piece of metal which forms the sides, such metal being folded afterwards into crimps, and the crimps flattened down over a wooden head which is held in place by nails driven through the periphery of the cylinder into the rim of the head.
Conceding, then, that it was old to crimp in and fold the ends of cylindrical cartridges and boxes of pasteboard, or other stiff material, as shown in the Hazeltine patent, and also that it was old to turn the edge of metallic cylindrical vessels or packages to hold separate bottoms or heads of such vessels and packages, it is evident that, if the first claim of the Hoff patent can be supported at all, it can only be for the formation of the entire bottom of the crimped material, and the resultant increase in its thickness.
Defendant is making a coal-hod after a patent granted to Henry S. Reynolds, No. 304,033, dated August 26, 1884, the principal advantages of which are declared by the patentee to be an increase of strength and durability of the vessel, and a decrease of the cost of production. To accomplish these objects he partially forms the bottom out of the metal forming the body, and closes the aperture and completes the bottom by a cap. The blank is cut out in the ordinary way, and is then formed up by bending its edges around and uniting them to form the body. The next operation consists in placing the body in an inverted position, in a stamping press of the requisite power, and subjecting it to compression between dies, of suitable shape, to fold its lower edge inwardly, and to form a series of ribs tapering towards the center. The next step consists in placing the body in a press, and, by the action of another set of dies, flattening the ribs, and thereby partially forming the bottom of the vessel out of a portion, and in one piece with the body, the walls of the ribs folding in upon the metal between them, and thus increasing the thickness of a portion of the bottom, and, consequently, increasing its strength and durability. To finish the bottom, he employs a cap punched out of sheet metal, inserted in the partially completed bottom, its rim resting upon the inside, and its body projecting through the aperture, and so flattened down upon the crimps as to completely close the aperture and bind the ribs. Under the narrow construction we are compelled to give the Hoff patent, it is evident this is no infringement. Whether the result produced be or be not inferior to the Hoff hod, of course is not involved in this case. It may be true that Reynolds conceived the idea of his hod from an examination of the Hoff device; but he is none the less entitled to claim that the Hoff patent had been anticipated by prior devices, especially when such prior devices appear to show a complete anticipation of his own. Indeed, both of these parties seem to have been gleaning in a fied a lready open to the public.
It is clear that the second claim of the Hoff patent for 'a coal-hod formed of a single piece, and having its bottom crimped or folded to form a series of annular ribs or rings of progressively increasing diameter,' is not infringed by the Reynolds device, as no such rings or ribs, or anything approximating to them, is shown in the defendant's hod.
The decree of the court below must be affirmed.

## Notes

This work is in the public domain in the United States because it is a work of the United States federal government (see 17 U.S.C. 105).
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