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:
Mar. 05, 1991
Filed:
Sep. 01, 1989
Applicant:
Inventor:
Lewis A Frostick, Peck, MI (US);
Assignee:
Saturn Corporation, Troy, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ; F01M / ;
U.S. Cl.
CPC ...
210136 ; 210168 ; 210251 ; 137 72 ; 1231 / ; 1231 / ; 184-63 ; 184-624 ;
Abstract
An oil filter for an internal combustion engine lubrication system has an anti-drainback valve that is temporarily held open with a quantity of special grease during the initial filling of the engine's oil lubrication system with oil, and then passively melts or dissipates upon contact with the oil so as to allow the anti-drainback valve to thereafter close.