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. 13, 1995
Filed:
Sep. 24, 1993
Applicant:
Inventor:
Roger L Frick, Hackensack, MN (US);
Assignee:
Rosemont Inc., Eden Prairie, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G01L / ;
U.S. Cl.
CPC ...
324688 ; 324661 ; 73718 ; 73862626 ; 3612831 ;
Abstract
A pressure sensor measures pressure by measuring capacitance between two capacitive plates. Pressure change appears as a change in capacitance. Stray capacitance interferes with this measurement. The stray capacitance arises between the capacitor plates and surrounding material. Circuitry reduces stray capacitance by maintaining substantially no potential difference between a capacitor plate and surrounding material responsible for stray capacitance.