delivered tbe opinion of tbe Court:

It appears that the application of Stephen P. Gibbons was filed March 21, 1903, that tbe application of Morris Peller ivas filed January 8, 1902, and that all tbe tribunals of tbe Patent Office have awarded priority of invention to Peller, tbe senior party. We find no error in tbe decision of tbe Commissioner of Patents upon tbe issue now before us. Tbe issue of this interference is as follows:

“1. In a rustless suspender buckle, tbe combination with a *532frame having an upper and a lower side with an opening between the same, of a lever pivoted to the upper side of the frame in position to have its clamping edge coact with the upper edge or top of the lower side of the frame, and a piece of webbing having its lower reach attached to the lower side of the frame, and its upper reach passed from front to rear through the said opening, and engaged by the clamping edge of the lever, which deflects it over, or approximately over, the upper edge or top of the lower side of the frame.

“2. In a rustless buckle, the combination with a frame having an upper and a lower side with an opening between them, the lower side of the frame being wider than the upper side to form a finger-piece, of a lever pivoted to the smaller upper side of the frame in position to have its clamping edge coact with the upper edge or top of the wider lower side of the frame, and a piece of webbing having its lower reach attached to the lower side of the frame, and its upper reach passed from front to rear through the said opening, and engaged by the clamping-edge of the lever, which deflects it over, or approximately over, the upper edge or top of the lower side of the frame, whereby the upper reach of the webbing is brought into, or approximately into, line with the lower reach of the webbing on the back of the buckle when the webbing is under draft as in use.”

Of numerous parties once included in this interference, only G-ibbons and Peller remain. Peller did not testify, nor is there any testimony confirming the dates of conception of invention and disclosure alleged by Peller in his preliminary statement. There are circumstances indicating that after Peller had assigned his interest he became indifferent to the rights of his assignee, the Waterbury Buckle Company. Maltby, the secretary of that company, testifies that in the fall of 1901 he corresponded with Peller, and talked with him about a “rustless buckle,” and that on December 31, 1901, buckles made in accordance with Peller’s disclosure were first shipped, and that the .buckle exhibited to him was substantially the same as those then shipped, and this buckle embodies the issue of this interference. Thus December 31, 1901, is the date of reduction to *533practice by Peller. Gibbons is the junior party, and the burden of proof is upon him, and to prevail he must prove a reduction to practice prior to the last mentioned date, or, at least, to January 8, 1902, when Peller filed his application, or a prior conception followed by due diligence in reduction to practice. Gibbons claimed that he conceived the invention in November, 1900, and that he disclosed it to M. L. and L. Rothschild then. These men were officers of the Connecticut Web Company, from which Gibbons, as manager of the Gibbons Manufacturing Company of Baltimore, bought supplies. Each of the tribunals of the Patent Office, after reviewing the testimony, conclude that Gibbons failed to make a disclosure to these persons of the specific form of buckle which is here in issue, and it is quite remarkable that although Gibbons alleges that he is the inventor, yet when he testifies, after repeated efforts he did not succeed in describing the invention in issue,. His testimony is vague- and indefinite upon the point, and the tribunals of the Patent Office concur that Gibbons had no conception of the invention in issue prior to the-time when the first shipment of Peller buckles was made, or to the time when Peller filed his application. The testimony of M. N. Rothschild appears to be unreliable, and it is not clear that the buckle he claims to have made for Gibbons can aid Gibbons’s case, for it does not appear to embody the invention in issue.

The Examiners-in-Chief say: “It is to be noted that this issue is specific and carefully drawn as to its language, and has only been held to be patentable after much discussion by the examiner and this board. Where the invention is so specific, any oral testimony must of course correspond in every detail with the requirements of the issue.” See Blackford v. Wilder, 21 App. D. C. 1. And, as the Commissioner of Patents says, this issue calls for a buckle with a frame having an upper and a lower side, with an opening between the same, of a lever pivoted to the upper side of the frame in position to have its clamping edge coact with the upper edge or top of the lower side of the frame, which is not found in this “buckle of original *534disclosure” produced by PL L. Eothschild. The device iu issue has a lever pivoted above the top edge of the lower side of the frame; the lever iu the buckle exhibited is pivoted to ears in the same plane as the frame of the buckle; and it is the former construction which produces the result of holding the web by deflection, rather than by a clamping action. At most, this buckle produced by Eothschild as Gibbons’s original disclosure was an experimental model put away in a drawer for years. It was in the nature of an abandoned experiment. Gibbons has given no explanation of his long delay in filing his application, except that he thought the huckle on which he did obtain a patent at home and three patents abroad was a better buckle, and he lacked the money to make an earlier application for the invention of the issue. That other invention Gibbons understood, although when repeatedly asked he repeatedly proved unable to state intelligently what the construction here in issue is. We agree with the tribunal of the Patent Office that Gibbons’s case wholly failed; and here discussion would end were it not that the appellant further urges that the testimony shows that Peller was not the inventor of the buckle shown in his application. Here the appellant relies upon the case of Oliver v. Felbel, 20 App. D. C. 260, where Oliver, when a witness in his own hehalf, swore that he did not claim to be the inventor of the mechanism embracing the particular combination of parts or elements specified in the issue of interference. The circumstances in this case are different. Maltby, the secretary of the Waterbury Buckle Company, did testify that, at one time after Peller had assigned his application for a patent to Plaltby’s Company, Peller intimated that he was not the real inventor of the construction shown in his application and now involved in this interference. It appears that Peller’s brother had been the mechanic in this instance, and the testimony indicates that Eothschild, who, with another, first made application for this invention, and later testified that it was Gibbons’s invention, and sought to explain the inconsistency by his former belief that the mechanic- who ^constructed the invention for another was the inventor, had ¿ibout this time striven to enlist Peller against Peller’s assignee, *535and it appears that Peller was at that time seeking a better agreement for a royalty from the Waterbury Buckle Company.

We do not find that Peller deliberately denied that he was the inventor, but we conclude that his acts and declarations and his refusal to testify at Maltby’s request were part of an effort to secure better terms from his assignee. When Peller executed the application in interference he testified under oath that he was the inventor, of the invention of the issue, and we do not find evidence sufficient to overcome it. The decision of the Commissioner is affirmed. The clerk of .this court will certify this opinion and the proceedings in this court to the Commissioner of Patents according to law. Affirmed.