The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1983
Filed:
Apr. 05, 1982
Peter Durenec, Annandale, VA (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
Spring loaded seals comprised of two resting rings positioned in an annular groove of a piston that are pressed against the upper and lower shoulders of the groove by a corrugated spring fitted therebetween. Each resting ring has at least one free-floating sealing wedge, preferably made of ceramic material, which overlaps the outer peripheral edge thereof for sliding along the cylinder wall wherein the sealing wedges frictionally press against the cylinder wall during the stroke of the piston in one direction and release to more freely slide along the cylinder wall in the other direction. The resting rings and sealing wedges form dry seals, i.e. unlubricated sliding seals, for use in compressor devices which operate at either high or low temperatures.