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:
Oct. 02, 1990
Filed:
Jan. 13, 1989
Applicant:
Inventor:
Seiji Sagou, Saitama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430 23 ; 430323 ; 430394 ; 430494 ; 313402 ; 445 47 ;
Abstract
A method for preparing a shadow mask with a plurality of apertures for a color picture tube from a metal shadow mask sheet includes the step of exposing the entire surface of the photosensitive layers provided on the both surfaces of the metal sheet to an unpatterned light before or after the step of exposing the photosensitive layers to patterned light in order to form resist films.