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:
Dec. 26, 1989
Filed:
Aug. 02, 1988
Applicant:
Inventor:
Nobushige Arai, Kitakatsuragi, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F24J / ; C25D / ;
U.S. Cl.
CPC ...
204 371 ; 126901 ; 204 40 ;
Abstract
A selective absorption film for selectively absorbing solar rays is composed mainly of cobalt oxide. A blue system selective absorption film having high heat resistance at high temperatures is provided by coating one surface of a metal material of iron or copper with cobalt, and treating the cobalt layer in a furnace in an oxidizing atmosphere for a desired time, while supplying water vapor into the furnace which is kept in an oxidizing atmosphere so as to carry out an oxidation treatment.