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:
Sep. 20, 1988
Filed:
Dec. 03, 1985
Applicant:
Inventors:
Satoshi Shimada, Hitachi, JP;
Yoshio Sato, Hitachi, JP;
Hiroshi Sasaki, Hitachi, JP;
Nobuyoshi Tsuboi, Toukai, JP;
Tetsuo Ito, Mito, JP;
Hideki Nihei, Hitachi, JP;
Norifumi Miyamoto, Hitachi, JP;
Hiroaki Koyanagi, Hitachi, JP;
Kanji Kawakami, Mito, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369100 ; 369 13 ; 369111 ; 369286 ; 369284 ; 365122 ;
Abstract
A film of a crystal - crystal phase transformation type optical recording alloy is formed on an insulating substrate. Information is erased from the alloy film by heating it with an expedient other than a laser beam. Information is read by sensing reflected light of light projected on the alloy film.