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:
Jan. 01, 1991
Filed:
Dec. 14, 1989
Applicant:
Inventors:
Donald Klemen, Carmel, IN (US);
James P Ordo, Plainfield, IN (US);
John R Bitner, Arlington, IN (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
188294 ; 192 / ; 303 11 ;
Abstract
A hydraulic retarder has a control valve mechanism with a regulator valve for controlling the pressure of the fluid delivered to the retarder as a function of operator demand and an operating parameter of the retarder. The regulator valve has an opening pressure bias that is determined by a retarder signal valve which is responsive to an operator input and a closing pressure bias determined by the outlet pressure of the retarder.