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:
May. 11, 1993
Filed:
Jun. 27, 1991
Applicant:
Inventors:
Toshio Oshima, Osaka, JP;
Masato Nishida, Kyoto, JP;
Tsunemi Ohiwa, Osaka, JP;
Tsutomu Yamaguchi, Takatsuki, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
250271 ; 235463 ; 235468 ; 235473 ; 235491 ; 2504581 ; 2504591 ; 2504611 ;
Abstract
A detection mark comprising a pattern formed from a thin phosphor layer which emits a light having a different wavelength from that of an excitation light irradiated on a surface side of the phosphor layer, and an undercoat layer which is formed on a rear surface side of the phosphor layer and reflects the excitation light, which mark can be detected by intermittently irradiating the excitation light to the mark and reading a light or afterglow from the phosphor layer.