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:
Feb. 21, 1978
Filed:
Mar. 09, 1977
Applicant:
Inventor:
Stanley E Spencer, Palos Verdes Estates, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B65D / ;
U.S. Cl.
CPC ...
277 44 ; 277 48 ; 277164 ; 277165 ; 277194 ; 277D / ;
Abstract
A relatively small bidirectional polymeric piston seal especially useful for cryogenic refrigerators having an E-shaped metallic spring retainer and two wound spring seal expanders positioned between two L-shaped polymeric seals. The L-shaped design permits the use of conventional tooling with high strength abrasive polymeric compounds while maintaining tighter tolerances during manufacture thereby keeping frictional resistance at a uniform level to produce longer wear life at the required high pressure forces in two directions.