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. 13, 1990
Filed:
Sep. 22, 1989
Applicant:
Inventors:
Reginald J Barrus, Jefferson, LA (US);
Donald J Barrus, Los Alamintos, CA (US);
Theodore A Kritikos, New Orleans, LA (US);
John W Owensby, New Orleans, LA (US);
Assignee:
KOB, Inc., Gretna, LA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166 53 ; 137493 ; 251-5 ; 166326 ;
Abstract
A mud saver valve for automatically closing to prevent loss and spilling of drilling mud. The valve contains a diaphragm, rigid backup means and diaphragm support means so that the valve can be used in high pressure wells.