There is only one claim in this patent, and its pith is that the same last is made capable of being placed and held in a horizontal position or in an oblique one, at the option of the user, merely by reversing it. The essence of the device is a standard with a tenon at the upper end, one side of which tenon runs in a vertical line and the other side in an oblique line, and a last with a socket in it, which the tenon- fits exactly. When the last is fitted to the tenon in one oosition, it lies horizontally, or substantially so, and, when placed in the reverse position on the tenon, it lies obliquely; and in each case, on account of the simplicity of construction, it is held firmly. The purpose sought by this reversibility is not set out in the patent, and is differently stated by the counsel on either side, but its advantages are obvious. Previous to this device and Dusenbery’s device, to which we will hereafter especially refer, its purpose was accomplished by using two standards or two lasts'. Numerous patents are proven for the purpose of showing anticipation; but, aside from Dusenbery’s, the purpose and principle of the operation of each of them were so substantially different that we need not refer to them in detail. The principle of operation of the device in issue results from the application of a certain geometrical form, and is perfectly apparent to any geometrician; but whether or not, prior to the two patents to which we shall limit our discussion (that of the complainant below and that of Dusenbery), the principle had been applied in the arts to such an extent as to render unpatentable its application to any particular art, is not shown by the record, and cannot be determined by us as a matter of common knowledge; and we are therefore brought to the conclusion that either the patent sued on, or the other patent to which we will especially refer, was the first in which the principle in question was adapted to this art, and that its adaptation was not so clearly lacking in invention as to overcome the presumption arising from the issuing of the patent.
On the mere question of infringement there appears to be no difficulty. The essential question is that of anticipation by Dusenbery. The complainant’s application was filed March 21, 1890, and his patent issued December 23, 1890. Dusenbery obtained a patent for a pegging jack, issued June 24, 1890, on an application filed
It will be noticed that Dusenbery’s application was first filed; so that it is settled law that the burden was thrown on the complainant below to prove priority in behalf of his patent to the satisfaction of the court, and by evidence which shall strongly outweigh that of the respondents below, if not beyond a reasonable doubt. Manufacturing Co. v. Sprague, 123 U. S. 249, 264, 8 Sup. Ct. 122; Clark Thread Co. v. Willimantic Linen Co., 140 U. S. 481, 492, 11 Sup. Ct. 846; Walk. Pat. (3d Ed.) 70. The inherent dangers of oral proofs in this class of cases are explained in The Barbed-Wire Patent. 143 U. S. 275, 284, 285, 12 Sup. Ct. 443, 450, and in Deering v. Harvester Works, 155 U. S. 286, 300, 301, 15 Sup. Ct. 118. On an issue made directly between the two patents under section 4918 of the Revised Statutes, or otherwise, the complainant below would be required to prove earlier invention in his behalf beyond reasonable doubt. Morgan v. Daniels, 153 U. S. 120, 34 Sup. Ct. 772. And, as shown by the cases cited, the same would be the fact if he should be sued for infringement by the holder of the Dusenbery patent. It is inconvenient, and tends to the doing of injustice and the possibility of imposing double liability, to have different rules as to the practical amount of proof required on the same issue because it happens to he presented as between different parties. It is admitted that Dusenbery’s invention was perfected as early as April 25, 1889. Therefore it rests on the complainant below to prove invention prior to the last-named date. Mr. Cox, who was the solicitor who obtained the complainant’s patent, testified that he first saw this invention in December, 3888, and that some time about six months after this he investigated the state of the art at Washington, and subsequently secured the patent. He fails, however, to support this date by any collateral fads, unless, by the matter of preparing the illustration to which we will refer. Oox had an interest in a designing and engraving business, and ho testified that the complainant’s device was brought to him for the purpose of making illustrations of it. He produced a bill, under
On the whole, we must apply to this case the practical safeguards against the frequently mistaken memory of witnesses as to events of this character long since happening, which the courts are always insisting on with reference to the issue of anticipation. Doing this, it seems plain that the complainant below has come far short of proving his prior right as satisfactorily as required by the authorities and by the'reason of tiie case. Indeed, in view’of the absolute lack of illustrations, book entries, purchasers, bills, patterns, or castings of the early date in dispute, we are safe in saying that the preponderance of probabilities is against him. The decree of the circuit court is reversed, and the case is remanded to that court, with directions to dismiss the bill, with the costs both of this court and of the circuit court for the defendants below.