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. 01, 1991
Filed:
Nov. 24, 1989
Applicant:
Inventor:
John R Coleman, Dayton, OH (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60T / ; F15B / ;
U.S. Cl.
CPC ...
60585 ; 33722 ; 73 6 / ; 73 6 / ; 116227 ;
Abstract
A dipstick in the brake fluid reservoir of a brake system of the type having one or more pistons carrying a seal of elastomeric material subject to swelling upon exposure to the presence of a foreign fluid other than brake fluid. A piece of elastomeric material of the same type as the elastomeric material of the piston seal is mounted on the dip stick at a level thereon to be consistently submerged in the brake fluid whereby the presence of the seal swelling foreign fluid in the brake fluid reservoir will be detectable by examination of the piece of elastomeric material upon removal of the dip stick from the reservoir.