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:
Dec. 11, 1990
Filed:
Sep. 28, 1989
Applicant:
Inventors:
Haruo Suzuki, Saitama, JP;
Hiroya Gotoh, Saitama, JP;
Assignee:
Jidosha Kiki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
913692 ; 9137 / ; 92 48 ;
Abstract
A brake booster includes at least two pairs of constant pressure chambers and variable pressure chambers defined within a shell. A clearance is defined between a stepped end face of a valve body which is disposed within the shell and a power piston which is mounted on the valve body at a location rearward of the stepped end face. The clearance is utilized to provide a communication between the constant pressure chambers, thereby allowing a reduction in the axial size of the valve body.