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:
Aug. 30, 1977
Filed:
Dec. 18, 1973
Applicant:
Inventors:
Eiichi Yamazaki, Ichihara, JA;
Hiromi Kanai, Mobara, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
96 361 ; 354-1 ; 427 68 ;
Abstract
A method for making a phosphor screen of a black matrix type color picture tube wherein use is made of two light sources, one being placed inside the faceplate of the tube and the other placed outside the faceplate, for carrying out a light exposure operation. An apparatus useful for such light exposure operation is also disclosed.