273 F. 365 | D.D.C. | 1921
The invention in interference relates to leak-proof piston rings, described in the opinion of the Board of Examiners in Chief as follows:
“The invention at issue relates to leak-proof piston rings and includes an inner slip expander ring having outer inclined faces and being of a width to fill the opening of the groove in a piston. Outer triangular split metal packing rings fit the inclined faces of the inner ring and are of thin cross-section, so as to be forced into contact with the wall of the cylinder by the expander ring.”
The decision of the Commissioner of Patents is affirmed.
Affirmed.
Mr. Justice HITZ, of the Supreme Court of the District of Columbia, sat in the place of Mr. Justice ROBB in the hearing and determination of this appeal.