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:
Feb. 22, 2005
Filed:
Mar. 18, 1999
Tatsuaki Ishida, Osaka, JP;
Kiyokazu Tohma, Osaka, JP;
Keizo Miyata, Osaka, JP;
Yoriko Takai, Osaka, JP;
Taizou Hamada, Osaka, JP;
Hiroshi Ryonai, Osaka, JP;
Tatsuaki Ishida, Osaka, JP;
Kiyokazu Tohma, Osaka, JP;
Keizo Miyata, Osaka, JP;
Yoriko Takai, Osaka, JP;
Taizou Hamada, Osaka, JP;
Hiroshi Ryonai, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A master information carrier with excellent durability is provided, for the use of static and a real lump-sum recording of digital information signals on magnetic recording medium. The master information carrier comprises a non-magnetic substrate on which a ferromagnetic film is disposed with an embossed pattern. Protrusions of the embossed pattern correspond to a disposition of the digital information signals. Recessed portions of the embossed pattern of the ferromagnetic film are filled with non-magnetic solid material. Alternately, A non-magnetic substrate has an embossed pattern and recessed portions of the embossed pattern correspond to a disposition of the digital information signals. A ferromagnetic film is filled in the recessed portions of the embossed pattern.