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. 11, 1979
Filed:
Aug. 15, 1978
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A method of forming an insulating film of high breakdown voltage on a polycrystalline substance layer which comprises the steps of preparing the polycrystalline substance layer; selectively removing the polycrystalline substance layer; heat-treating for the first time that portion of the polycrystalline substance layer which is left after said selective removal in an oxidizing atmosphere to provide an oxide layer; removing the whole of said oxide layer; and heat-treating for the second time in an oxidizing atmosphere the polycrystalline substance layer which is now exposed due to removal of said oxide layer, thereby forming a second oxide layer acting as an insulating film on said exposed surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile