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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.:

US 5641884 B1

PDFFull Text
Date of Patent:
Jun. 24, 1997

Filed:

Dec. 27, 1994

Spiro-naphtho-oxazine compound and photosensitive materials using the

Applicant:
Inventors:

Akira Utsunomiya, Tokyo, JP;

Shinichi Sato, Tokyo, JP;

Hiroyoshi Yamaga, Tokyo, JP;

Nobuo Suzuki, Tokyo, JP;

Assignee:

Hodogaya Chemical Co., Ltd., Tokyo, JP;

Attorney:

Sherman and Shalloway

Primary Examiner:

Matthew V Grumbling

Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
544 71 ; 252586 ; 359885 ; 544 586 ;
Abstract

A spiro-naphtho-oxaine compound having a specific substituent providing red color development which has been unknown in the past, and photosensitive materials containing the compound. Since the compound is superior in fatigue resistance and has a sufficient red color developing density, it is used in plastic articles, optical filters, recording materials, textiles, decoration materials, and toys, which change in color by light irradiation to develop a magenta color.

Find Patent Forward Citations

Utsunomiya, Akira. (1997). Spiro-naphtho-oxazine compound and photosensitive materials using the (U.S. Patent No. 5641884). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5641884

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