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. 21, 1987
Filed:
Apr. 16, 1982
Applicant:
Inventor:
Yoshifumi Tomita, Mobara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430 24 ; 430 25 ; 430 28 ; 430 29 ; 430144 ; 430291 ; 430292 ;
Abstract
A fluorescent screen of a color picture tube is manufactured by the steps of forming a film of substance which becomes sticky when exposed to light on an inner surface of a panel of the tube, exposing predetermined portion of the film through a shadow mask to render sticky the exposed portions, repeatedly applying powders of phosphors of respective colors onto the portions which became sticky so as to form phosphor picture elements of respective colors, exposing portions of the film other than the predetermined portions to render them sticky, and applying a powder of graphite to the portions other than the predetermined portions to form a black matrix film.