This is an appeal from a judgment, entered September 4, 1940, adjudging Clairm 5 of Patent 1,736,533 invalid for lack of invention. The patent, entitled an “End' Extension Table,” was issued November 19, 1929, to Robert W. Irwin and NicholasBekius. Plaintiff’s title and ownership are conceded. The article -described is known as a refectory table with an extensions leaf, supported on wooden slides, capable-of being housed under the main fixed tabletop when not in use, and of being withdrawn and elevated to- form an extension' of the main top whenever desired. The--court below found that the claim in suit was anticipated by Bohr Patent No. 522,101,. issued June 26, 1894, and by Ruthke British' Patent No. 8545, issued April 30, 1895, and' that these patents were not considered by the Patent Office during the prosecution of the application for the patent in suit. The-court also found that there was no patentable invention in the claim in suit because-of the Bohr and Ruthke patents in connection with other prior art references.

The claim is copied in a footnote.1 Structures made in accordance therewith, as well* as the Bohr and Ruthke patents, were introduced in evidence. These structures are-so similar in method of operation that we-find it difficult to describe that which plain*637tiff claims as invention. In general we think it may be safely stated that the extension leaf in each of the structures is withdrawn from beneath the main top of the table to a position abutting the same in practically the same fashion. As we understand plaintiff’s contention, it relies upon the means described in the latter portion of its claim by which the extension leaf is elevated to the same plane with the main top, and means holding the extension top in the same plane therewith when it is moved into abutting engagement. There is no question but that the extension leaf of Bohr and Ruthke are on a plane with the main top when they are brought in abutting positions. The claimed novelty of plaintiff’s invention lies in the fact that the extension leaf, in the course of operation — that is, removing it from beneath the main top — is in a plane therewith at a time before it assumes an abutting position. This is due to the fact that the bars upon which the extension leaf is fastened and which extend back and beneath the main top, have their inner ends turned downwardly and inwardly. The bars on which the extension leaf of Bohr is fastened are straight and, therefore, when the leaf is removed from beneath the table and first raised, it is in a position higher than the main table top, but just as the patent in suit, it assumes the same plane when abutted to the main top. This difference in the bars on which plaintiff’s extension leaf is fastened, so it is argued, makes it possible to operate the device with one hand.

Defendant disputes this claimed advantage and claims that the Bohr device can also be operated with one hand. The structure of the latter patent before us indicates that this is true, but whether so or not, it appears to us that the change or improvement claimed by the patent is well within the realm of mechanical skill. In Ruthke, the bars upon which the extension leaf is fastened are very similar in shape and mode of performance to those on which plaintiff’s extension leaf is placed. They are not straight as shown by Bohr, but are widened at the inner end. It appears that the position of the extension leaf in relation to the main top, during the course of operation, is dependent upon the size or shape of the inner end of the bar. We are unable to appreciate the claimed advantage for the structure in suit. After all, the extension leaf of the prior art, when finally in place for service, is on a plane with the main top. The final result is the same.

We are of the opinion that the District Court properly found the claim in suit anticipated by the prior art, and we are certain, that in view of such art, there is no such novelty or utility disclosed which entitles it to the status of invention.

The judgment of the District Court is affirmed.