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.

Date of Patent:
Dec. 18, 1984

Filed:

Nov. 08, 1982
Applicant:
Inventors:

Sadanori Nishimura, Saitama, JP;

Keiichi Ishikawa, Saitama, JP;

Hiroyuki Shimada, Saitama, JP;

Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60K / ;
U.S. Cl.
CPC ...
74868 ; 74869 ; 74878 ;
Abstract

An hydraulic transmission interposed between an engine and the wheels of a vehicle is controlled by hydraulic circuits and hydraulically-operated clutches. A shift valve assembly is supplied with oil pressure in accordance with the extent of opening of the throttle of the engine, as well as vehicle governor pressure acting as a vehicle speed signal. The shift valve assembly not only functions to control operation of hydraulic clutches but also acts as a malfunction-preventive valve which operates to impede engagement of the reverse transmission clutch during forward running of the vehicle at a speed higher than a predetermined vehicle speed, irrespective of the throttle valve opening.


Find Patent Forward Citations

Nishimura, Sadanori. (1984). Malfunction prevention device of automotive hydraulic transmission (U.S. Patent No. 4488457). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4488457

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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