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. 04, 1995
Filed:
Dec. 26, 1990
Applicant:
Inventors:
Motoyasu Terao, Tokyo, JP;
Kunikazu Ohnishi, Yokohama, JP;
Tesuya Nishida, Koganei, JP;
Hiroshi Yasuoka, Kokubunji, JP;
Keikichi Ando, Musashino, JP;
Norio Ohta, Iruma, JP;
Hirofumi Sukeda, Kokubunji, JP;
Yoshito Tsunoda, Tokyo, JP;
Toshimitsu Kaku, Sagamihara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369116 ; 369 4437 ;
Abstract
According to the present invention, a so-called overwrite operation which records new information while erasing existing information can be reliably performed in an information storage system such as optical disk system. In addition, whether the rewriting of recording has been properly done can be verified.