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. 29, 2003
Filed:
Dec. 06, 2000
Tsutomu Shiratori, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A recording film is formed on a surface of a substrate, including the slopes, which are positioned on both sides of each information track and have surfaces not parallel to the surfaces of the information tracks. The surface of the substrate is sputter-etched by accelerated ions impinging against the substrate surface in a substantially vertical direction. The recording film on each slope is etched away based on the dependence of a sputtering rate upon an incident angle of the ions, while the recording film remains on the surface of each information track.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile