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:
Jun. 13, 1989
Filed:
Aug. 27, 1987
Kaname Sawada, Yokohama, JP;
Kazuo Suzuki, Funabashi, JP;
Shinji Hasunuma, Tokyo, JP;
Eizo Katayama, Yokohoma, JP;
Motoyasu Ohno, Itabashi, JP;
Tsukasa Kanazawa, Tokyo, JP;
Keiji Ueki, Yokohama, JP;
Matsushita Graphic Communication Systems, Inc., Tokyo, JP;
Abstract
An optical disc is subdivided into a plurality of concentric tracks. The tracks are further subdivided into a plurality of sectors. A method for recording data on such an optical disc includes the steps of designating some of the sectors as preliminary sectors and the remaining sectors as user sectors, identifying defective user sectors, and recording data corresponding to the defective sectors on the preliminary sectors.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile