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:
Aug. 20, 1991
Filed:
Dec. 04, 1989
Masaya Nikaido, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
An oil pump includes a pair of pump cartridges, one of which can be unloaded. Oil which is discharged from one of the pump cartridges is supplied to an accumulator through a supply passage in which an orifice is provided. The orifice is opened and closed in response to a pressure which prevails in the accumulator. A spool is operated upon by a pressure differential across the orifice to return the discharged oil to the suction side of the pump. A clearance is formed between the outer surface of the spool and the inner surface of the valve opening in which the spool is fitted, permitting the oil in a chamber into which a pressure prevailing downstream of the orifice is introduced to be returned to the return path.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile