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. 08, 1998
Filed:
Nov. 12, 1997
Fumiyoshi Kirino, Suginami-ku, JP;
Tsuyoshi Toda, Kodaira, JP;
Hiroshi Ide, Kodaira, JP;
Hisataka Sugiyama, Kodaira, JP;
Atsushi Saito, Ichikawa, JP;
Hiroyuki Tsuchinaga, Kokubunji, JP;
Takeshi Maeda, Kokubunji, JP;
Fumio Kugiya, Hachiouji, JP;
Toshimitsu Kaku, Sagamihara, JP;
Seiichi Mita, Tsukui-gun, JP;
Kazuo Shigematsu, Kitakatsushika-gun, JP;
Yasuhide Ouchi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A super high density optical disk apparatus is obtained by using an exchangeable recording medium having a recording capacity of at least 1.5 Gb/in.sup.2 in an optical recording and reading apparatus for recording or reading at least using a laser beam or by using one of means which can record on a recording medium only once and means which can record at least two times repeatedly as recording means to be used.