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:
Oct. 08, 1991
Filed:
May. 15, 1990
Ryoichi Yamamoto, Kanagawa, JP;
Shizuo Umemura, Kanagawa, JP;
Kiichi Kato, Kanagawa, JP;
Takashi Yamada, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magneto-optical recording medium comprises a substrate and a magneto-optical recording film overlaid on the substrate. The magneto-optical recording film is composed of a first protective dielectric layer, a recording layer, a second protective dielectric layer, and a reflection metal layer, which layers are overlaid in this order on the substrate. The thickness of the first protective dielectric layer falls within the range of 950 .ANG. to 1,300 .ANG.. The thickness of the recording layer falls within the range of 200 .ANG. to 400 .ANG.. The thickness of the second protective dielectric layer falls within the range of 100 .ANG. to 600 .ANG.. The thickness of the reflection metal layer falls within the range of 200 .ANG. to 800 .ANG..