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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.:

US 4987782 B1

PDFFull Text
Date of Patent:
Jan. 29, 1991

Filed:

Oct. 03, 1989

Capacitive pressure transducer system

Applicant:
Inventors:

Zvi Shkedi, Worcester, MA (US);

James S Lepkowski, Glendale, AZ (US);

Karl S Pogany, Jr, Tucson, AZ (US);

Gerald W Meyer, Tucson, AZ (US);

Assignee:

Allied-Signal Inc., Morris Township, Morris County, NJ (US);

Attorneys:

Smith; Robert C.

Black; Joseph R.

Walsh; Robert A.

Primary Examiner:

A D Pellinen

Assistant Examiner:

Brian Johannssen

Int. Cl.
CPC ...
G01L / ; H03B / ;
U.S. Cl.
CPC ...
73718 ; 361283 ;
Abstract

A capacitive ratioing oscillator circuit utilizing a prior art pressure capsule, but through modification of the state variable oscillator circuit achieves a digital output which varies with the square root of the capacitance ratio C35 C.sub.p /C.sub.r. In this sensor the dielectric constant of the pressure media is measured in time with the pressure difference measurement. The oscillator includes a differentiator-inventor step herein each of capacitors C.sub.r and C.sub.p are connected to a common point and resistors are connected in parallel with each of said capacitors and with the common point connected to the inverting terminal of a first operational amplifier, a feedback line is connected from the output of the operational amplifier to the second resistor opposite the common point, first and second integrator circuits are connected to the output of said operational amplifier, a limit circuit is connected across the output of the second integrator circuit, and a feedback line is connected from the output of the second integrator circuit, and a feedback line is connected from the output of the second integrator circuit to the input of the inverter stage.

Find Patent Forward Citations

Shkedi, Zvi. (1991). Capacitive pressure transducer system (U.S. Patent No. 4987782). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4987782

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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