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:
Feb. 23, 1993
Filed:
Dec. 17, 1990
Applicant:
Inventors:
James K Roberge, Lexington, MA (US);
Martha L Gray, Cambridge, MA (US);
Assignee:
Massachusetts Institute of Technology, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324662 ; 324661 ; 324678 ;
Abstract
A technique for measuring capacitance and displacement, in which two circuits are combined, one that produces a current proportional to capacitance, and another that integrates that current between two reference levels, and supplies an output proportional to the integration time. In preferred embodiments, the first circuit is a capacitive pump circuit, and the second circuit a dual-slope integrator.