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:
Oct. 25, 1994
Filed:
May. 03, 1993
Applicant:
Inventors:
John R Dennis, Duncan, OK (US);
Steven L Cook, Duncan, OK (US);
Monty E McElroy, Duncan, OK (US);
Charles D Totty, Duncan, OK (US);
Assignee:
Halliburton Company, Duncan, OK (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01L / ;
U.S. Cl.
CPC ...
73718 ; 73152 ; 3612833 ; 3612834 ;
Abstract
A capacitive differential pressure sensor comprises two end pieces and a central diaphragm all of the same type of electrically non-conductive material, such as quartz. As the central diaphragm moves relative to the end pieces in response to pressures applied through the end pieces, capacitance changes are sensed through one pair of facing electrodes on one end piece and the diaphragm and another pair of facing electrodes on the other end piece and the diaphragm. A method of measuring differential pressures at an oil or gas well with such a sensor is also disclosed.