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:
Jun. 10, 2003
Filed:
Feb. 28, 2002
Applicant:
Inventor:
Laurent Demia, Macon Cedex, FR;
Assignee:
Schlumberger Technology Corporation, Sugar Land, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/700 ;
U.S. Cl.
CPC ...
E21B 4/700 ;
Abstract
In order to measure forces F exerted on a part in a given direction and in the presence of an external pressure p, the part has integrated therein a sensor ( ) which delivers an output signal of the form S=&agr;.F+&bgr;.p+&ggr;, and said sensor is dimensioned in such a manner as to cause the coefficient &bgr; to be zero. To this end, a sensor ( ) is used that includes a tube ( ) formed by a thinner walled portion ( ) and a thicker walled portion ( ), together with strain gauges ( ) mounted in the tube ( ) and interconnected to form a Wheatstone bridge.