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:
Nov. 28, 1989
Filed:
Feb. 28, 1989
James L Swindal, East Hampton, CT (US);
Daniel H Grantham, Glastonbury, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
Semiconductor structures for electronic use, such as for example a silicon-glass-silicon pressure sensor (Fig. 3), include mesa or pedestal structures (12A) extending up from silicon substrates (12). In the invention the mesa structures are fabricated in an oxidation process applied in a cyclical fashion (steps 1-3 through 1-5 of Fig. 1). Each cycle includes a photolithographic operation to protect the previously grown oxide on the mesas from etching. During each cycle less oxide is grown (or conversely silicon consumed) on the mesas than in the preceding cycle, while equivalent amounts of oxide are grown on non-mesa areas in each cycle. As a result, the tops of the mesas get higher and higher above the surrounding areas in each cycle. In order to prevent the leaving of any oxide 'scraps' in a non-mesa area during the oxidation steps, resulting from a flaw in the mask, a double exposure process is used, utilizing two completely independent masks, with a positive working photo-resist.