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:
Sep. 27, 1977
Filed:
Dec. 08, 1975
Applicant:
Inventors:
Joe K Heilhecker, Houston, TX (US);
Everett H Lock, Houston, TX (US);
Fred H Deily, Houston, TX (US);
Assignee:
Exxon Production Research Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
340 / ; 340 / ; 175 50 ; 175104 ; 33312 ;
Abstract
Apparatus for use in a rotary drill string to maintain electric continuity therethrough includes an externally insulated electric conductor tube having an electric cable mounted therein. The cable is telescopically movable with respect to the tube, and its lower end is in sliding contact with the interior of the tube. As drilling progresses, the cable may be extended relative to the tube, the sliding contact of the lower end of the cable maintaining electric continuity in the system.