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:
Apr. 01, 1997
Filed:
Jun. 30, 1995
Applicant:
Inventor:
Albert S Davis, Richmond, TX (US);
Assignee:
Bettis Corporation, Waller, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
91440 ; 91450 ;
Abstract
Tandem arranged cylinders having a common wall therebetween, with a common piston rod extending through said common wall, said rod carrying a piston for reciprocation within each said cylinder, and a valve member for fluid communication between said cylinders, permitting pressure equalization therebetween.