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:
Jul. 21, 1981
Filed:
Mar. 31, 1980
Lloyd R Chapman, St. Clair Shores, MI (US);
John F Watton, Mt. Clemens, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
In a preferred embodiment, a method is disclosed for applying a gamma alumina coating to a metal foil composed of an aluminum-containing ferritic stainless steel alloy and having an oxidized surface that is substantially covered by high-aspect alumina whiskers. The method comprises wetting the whisker-covered surface with a thixotropic alumina gel formed by mixing between about 4% to 6% by weight alumina monohydrate in water and acidifying with nitric acid to a pH below 2.0. While still wet, the primed surface is coated with a material consisting of gamma alumina powder suspended in a similar acid-stabilized aqueous alumina gel. The two-coat layer is air-dried and additional layers of the powder-containing material are applied and dried to form a gamma alumina coating of desired thickness.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile