In re Marshall

Hatfield, Judge,

delivered tbe opinion of the court:

This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the primary examiner rejecting claims 1, 2, 47, 48, and. 49 in appellant’s application for a patent for an alleged invention relating to improvements in piston rings for internal-combustion engines.

The appealed claims read as follows:

1. A packing for use with a reciprocating piston, said packing comprising a split radially expansible ring consisting of a ductile steel characterized by the inherent capability of forming a…