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:
Oct. 14, 1980
Filed:
Sep. 24, 1979
John J Bonner, Philadelphia, PA (US);
C William Clayton, Hatboro, PA (US);
Fischer & Porter Company, Warminster, PA (US);
Abstract
A capacitive pressure transducer constituted by a pressure sensor whose capacitance is caused to vary as a function of an applied pressure and a coupling assembly adapted to hydraulically convey the variable pressure of the fluid to be metered to the pressure sensor while isolating the structure of the sensor from the fluid. The sensor is formed by a cylinder, one end of which is enclosed by a deformable diaphragm that serves as one plate of a capacitor, deformation of the diaphragm in response to pressure acting to vary the dielectric spacing between the diaphragm plate and a second plate to produce a corresponding change in the value of the capacitance. The coupling assembly includes a body component having a column section and a base section, the column section being received within the cylinder of the sensor with its head spaced from the diaphragm to define therewith a sensor chamber which communicates through a passage in the column section with an isolation chamber formed at the bottom of the base section and sealed by a barrier diaphragm. The chambers and the passage are filled with hydraulic fluid whereby pressure applied to the barrier diaphragm by the fluid to be metered is transmitted to the sensor diaphragm.