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. 26, 1991
Filed:
Apr. 13, 1990
Applicant:
Inventor:
Dean Foote, Edmonton, CA;
Assignee:
Computalog Ltd., Edmonton, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
415230 ; 415903 ; 277-3 ;
Abstract
The disclosure relates to downhole drilling motors which include seal arrangements and pressure control assemblies for staging the pressure between the two seal assemblies, with each pressure control assembly including a rotary element for displacing a piston, and the piston controlling one or several valves.