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:
Sep. 17, 1991
Filed:
Aug. 21, 1990
Abstract
The substrate (12) and/or the diaphragm (11) of the pressure sensor (10) are made of ceramic, glass, or a single-crystal material. The side of the diaphragm (11) facing the substrate (12) is covered with a layer of silicon carbide, niobium, or tantalum which, in turn, is covered with a protective layer (21) and serves as one capacitor electrode (14). The side of the substrate (12) facing the diaphragm (11) is covered with at least one additional layer of any one of said materials which, in turn, is covered with an additional protective layer (22) and serves as the second capacitor electrode (15). Substrate (12) and diaphragm (11) are soldered together by a formed part of active solder (20) which also serves as a spacer. This pressure sensor can be manufactured in a single soldering step. The maximum load capacity of the diaphragm is determined not by the strength of the joint, but only by the strength of the diaphragm material. The pressure sensor can be used at higher temperatures than pressure sensors with glass-frit joints.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile