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:
Mar. 17, 1987
Filed:
Jan. 25, 1985
Applicant:
Inventor:
Shih-Ying Lee, Lincoln, MA (US);
Assignee:
Setra Systems, Inc., Acton, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01L / ;
U.S. Cl.
CPC ...
7386264 ; 1772 / ; 361283 ;
Abstract
Two pairs of parallel plate electrodes forming respectively a sensor capacitor and a reference capacitor are mounted on a parallelogram structure designed to deform under load in such a way that the gap width of the sensor capacitor changes as a function of load while the gap width of the reference capacitor is unaffected by the load. The capacitance of the reference capacitor is, however, similarly affected by temperature, humidity and other physical properties which may affect the dielectric constant of the medium, and is available for use in a ratio circuit to compensate for spurious changes in the sensor capacitance.