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:
Jul. 18, 1978
Filed:
Jul. 15, 1976
Applicant:
Inventors:
Motoo Akagi, Tokyo, JP;
Hazime Morishita, Tokyo, JP;
Saburo Nonogaki, Tokyo, JP;
Makoto Tanaka, Koganei, JP;
Tadao Kaneko, Tokyo all of, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ; H04N / ;
U.S. Cl.
CPC ...
252186 ; 96 361 ; 252 792 ; 252 94 ; 423272 ;
Abstract
A chemically digestive agent for releasing photoresist films comprising hydrogen peroxide and sulfamic acid is particularly suitable for the production of the fluorescent screen of a black matrix color television image receiving tube in that it has a strong releasing action for various photoresist films and low corrosiveness for machinery and appliances. The addition of a fixed amount of iron ion can further improve the characteristics of the chemically digestive agent.