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:
Jun. 28, 1988
Filed:
Apr. 29, 1985
Koji Sumiya, Nishio, JP;
Koji Kobayashi, Toyota, JP;
Haruki Takemoto, Chiryu, JP;
Seitoku Kubo, Toyota, JP;
Yutaka Taga, Aichi, JP;
Kazuaki Watanabe, Toyota, JP;
Aisin-Warner Ltd., both of, JP;
Toyota Motor Corp., both of, JP;
Abstract
A hydraulic servo for friction coupling devices of automatic transmissions, the hydraulic servo comprising: an annular drum including outer and inner cylinders and a side wall connecting the two cylinders together and mounted fixedly or rotatably within an automatic transmission case; an intermediate cylinder mounted concentrically in a predetermined position between the outer and inner cylinders of the drum; a return biasing means located between the intermediate and inner cylinders; and a connecting member securely connecting the return biasing means to a piston.