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:
Nov. 16, 1982
Filed:
Jan. 22, 1981
Applicant:
Inventor:
Hiroo Takeuchi, Ueda, JP;
Assignee:
Nissin Kogyo Kabushiki Kaisha, Ueda, JP;
Primary Examiner:
Int. Cl.
CPC ...
F15B / ; F15B / ;
U.S. Cl.
CPC ...
9137 / ; 9136 / ; 92 132 ; 92 138 ;
Abstract
A negative pressure booster wherein a brake master cylinder of an automobile is boosted and operated under negative pressure. The booster comprises a booster shell, a booster piston to divide the interior of the booster shell into a first and second actuator chambers, a valve cylinder, a valve piston received in the valve cylinder and a resilient valve body. During the retraction of the valve piston, the retracting force thereof is supported on the resilient valve body so that as the retracting force increases, the gap between the first valve seat and the valve portion increases.