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:
Oct. 03, 1989
Filed:
Sep. 21, 1987
Applicant:
Inventor:
Probir K Chatterjea, Mt. Prospect, IL (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
192-358 ; 192 8719 ; 1921 / ;
Abstract
A transmission control system for actuating a hydraulically controlled vehicle transmission that includes a pair of shiftable valve members determining four range speed conditions and two shiftable valve members determining whether the vehicle is in forward or reverse. Operating in conjunction with the speed range valve members is a fill control system which provides for rapid filling of the clutches and a pressure control system which provides for the controlled rate of energization of the clutches once the clutches have been filled to eliminate shift shock.