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:
Jan. 07, 2003
Filed:
Jun. 08, 2001
Applicant:
Inventors:
Yoji Iwamoto, Tokyo-To, JP;
Osamu Nakamura, Tokyo-To, JP;
Daisaku Haoto, Tokyo-To, JP;
Kenjiro Kaku, Tokyo-To, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K 1/906 ;
U.S. Cl.
CPC ...
G06K 1/906 ;
Abstract
An information recording medium ( ) comprises a base sheet ( ), a resin layer ( ) formed on the base sheet ( ) and having a holographic region ( ) provided with a diffraction grating ( ) in a regular or irregular arrangement, and a ferromagnetic thin film ( ) formed on the holographic region ( ) of the resin layer ( ). The ferromagnetic thin film ( ) has a specific magnetic characteristic dependent on a holographic pattern formed in the holographic region ( ). The magnetic characteristics of the ferromagnetic thin film are converted into signals corresponding to the holographic pattern.