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:
Jan. 13, 1987
Filed:
Jan. 18, 1984
Henry V Allen, Fremont, CA (US);
Wystron, Inc., Fremont, CA (US);
Abstract
An integrated circuit capacitive transducer measures at least one parameter of a medium to which it is exposed. A variable capacitor has a capacitance which varies as a function of the measured parameter and is charged by source of reference potential. The charge on the variable capacitor is then transferred to a second capacitor having a fixed reference capacitance. The voltage developed across the second capacitor by the charge transferred thereto is then a function of the capacitance of the first capacitor. Therefore, the voltage is also a function of the parameter being measured. The capacitance transducer may also include a further variable capacitor for measuring the difference of parameters between two mediums.