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. 20, 1990
Filed:
Aug. 14, 1985
William I Lehrer, Los Altos, CA (US);
Fairchild Camera and Instrument Corp., Mountain View, CA (US);
Abstract
A thick glass passivation layer comprises an alternating sequence of structurally dissimilar but chemically compatible layers of material over the surface of a substrate, so as to provide sufficient elasticity to compensate for thermal expansion differences that would otherwise crack causing in thick monolithic films. A first layer comprises glass that has been deposited over the surface of the structure using chemical vapor deposition. A second layer of the passivating glass material is then provided on the substrate using a spinning technique. The chemical vapor deposition and spun layers continue to be applied in an alternating fashion until a film having the desired thickness is formed. Each chemical vapor deposition layer provides an elastic cushion for the subsequently spun layers. The spun layers allows a planar topography to be maintained without the need for high temperatures.