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:
Jun. 21, 2011
Filed:
Jul. 14, 2008
Masao Ishida, Suwa, JP;
Masao Ishida, Suwa, JP;
Teikoku Piston Ring Co., Ltd., Tokyo, JP;
Abstract
A pistoncontains multiple ring grooveson the outer circumference of the piston, and piston ringsare mounted in the ring grooves. The pistoncontains oil path groovesextending respectively to the outer circumference of the pistonon the upper and lower surfaces of the lowermost ring groove, and an oil path grooveextending to the outer circumference of the pistonon the lower surface of the ring groovejust above the lowermost ring groove. The weight of the lowermost piston ringis equal to or smaller than the weight of the piston ringjust above the lowermost piston ring; and expandersare installed on the rear side of the piston ringsrespectively.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile