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:
Apr. 22, 1980
Filed:
Jan. 25, 1978
Theo J Popma, Eindhoven, NL;
Maria G Kamminga-Schrijnemakers, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Method of producing photomasks of X-ray amorphous iron oxide (Fe.sub.2 O.sub.3) by spraying a transparent substrate at a temperature between 180.degree. and 250.degree. C. with a solution of an hydrolysable iron salt in a polar organic solution or, in accordance with a variant of this method, at a temperature between 180.degree. and 750.degree. C. with a solution of a hydrolysable iron salt which also contains a salt of a metal having a greater ion diameter. If temperatures above approximately 230.degree. C. are used, the solvent may in the latter case also consist of water only.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile