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:
Jul. 14, 1992
Filed:
Mar. 20, 1991
Applicant:
Inventor:
Ugo Conti, El Cerrito, CA (US);
Assignee:
Electromagnetic Instruments, Inc., El Cerrito, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ; G01V / ; G01R / ;
U.S. Cl.
CPC ...
324258 ; 324247 ; 324339 ; 324346 ;
Abstract
A borehole magnetic sensor includes a plurality of primary detector coils, aligned along parallel axes, and connected in series with each other. A corresponding plurality of feedback coils, each associated with a respective detector coil, are arranged to cooperate with an amplifier system to provide negative feedback and null the magnetic field through the detector coils. The feedback coils are connected in parallel.