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. 20, 1998
Filed:
Jun. 26, 1996
Ikuo Hirose, Fuji, JP;
Jatco Corporation, , JP;
Abstract
A hydraulic control device for an automatic transmission includes a reverse inhibit valve for inhibiting a reverse gear position to be established when the reverse range is selected by mistake. This reverse inhibit valve is placed in a selected one of a first state in which a first port communicates with a third port, and a second state in which a second port communicates with the third port, depending upon whether a solenoid pressure is applied to one end of a spool of the valve. If the reverse range is selected during forward running of a vehicle, the reverse inhibit valve is placed in the first state in which the first port communicates with the third port, so that an oil pressure of a friction element is drained through the first port.