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:
Feb. 04, 1992
Filed:
Mar. 30, 1990
Applicant:
Inventors:
Yoshinobu Iwase, Aichi, JP;
Shiro Sonoda, Aichi, JP;
Kazuaki Watanabe, Aichi, JP;
Isamu Minemoto, Aichi, JP;
Teruo Akashi, Aichi, JP;
Assignee:
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F15C / ;
U.S. Cl.
CPC ...
74867 ; 13762569 ; 192 / ;
Abstract
A hydraulic control apparatus for an automatic transmission having a mechanical parking mechanism includes a manual valve disposed in the hydraulic control apparatus and having a parking (P) position, reverse (R) position, neutral (N) position and at least one forward speed position. The manual valve is provided with a drain port for releasing, in the parking position, the hydraulic pressure of a hydraulic circuit which establishes the reverse range, and the drain port is provided with an orifice which limits the discharge rate of hydraulic pressure.