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:
Feb. 03, 1987
Filed:
Jul. 06, 1981
Applicant:
Inventor:
Rainer Jurgens, Altencelle, DE;
Assignee:
Norton Christensen, Inc., Salt Lake City, UT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
367 85 ; 367 83 ;
Abstract
A downhole telemetry system for transmitting signals from a subterranean region in a well to the surface of the earth while drilling employs changes in the mud pressure encoded in digital form. The changes in mud pressure are accomplished by two balanced valves, one of which increases pressure by control of flow within the drill string, the other of which controls flow from the drill string to the annular between the drill string and the well.