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:
Apr. 07, 1987
Filed:
Aug. 12, 1985
Applicant:
Inventor:
Jonathan D Philby, Rugby, GB;
Assignee:
AE PLC, Warwickshire, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B28B / ; B23P / ;
U.S. Cl.
CPC ...
2642971 ; 291566 ; 29DI / ; 277215 ; 277220 ; 277193 ; 277D / ; 2642972 ; 264D / ; 419 66 ; 425D / ;
Abstract
A piston ring is formed by annular upper and lower parts which contact one another at respective surfaces normal to the axis of the piston ring. The parts can be injection moulded from thermoplastics materials with the parts themselves having no re-entrant portions, so allowing quick and easy manufacture, but with the parts together defining re-entrant portions such as a spring-receiving recess at the inward side of the ring or a pair of spaced oil control rails at the outward side of the ring.
Philby, Jonathan. (1987). Piston rings and their manufacture (U.S. Patent No. 4655983). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4655983
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile