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:
Aug. 22, 1995
Filed:
Aug. 20, 1993
Shih-Ying Lee, Lincoln, MA (US);
Setra Systems, Inc., Acton, MA (US);
Abstract
A capacitance pressure sensor includes a conductive diaphragm positioned between two pneumatically separate chambers. The diaphragm is supported at its periphery by a concave base member. An electrode assembly establishes a substantially planar conductive surface opposite to, and spaced apart by a nominal gap from, the conductive diaphragm. The electrode assembly includes the conductive surface and a single support element secured to, and extending through the base member. A glass dielectric fixes the support element to a collar which may be welded, brazed or soldered to the base member. The glass dielectric provides both mechanical support and high quality electric insulation between the electrode and the housing. By prefabricating the electrode support element with the collar and securing the collar to the housing after the dielectric has cured, problems associated with thermal expansion and contraction are avoided and the dimension of the nominal gap may be precisely controlled at a relatively low cost.