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:
Sep. 28, 2004
Filed:
Jun. 05, 2002
Applicant:
Inventors:
Noriharu Matsudate, Kujuukuri, JP;
Nobuhiko Hosotani, Mobara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 1/518 ; H01J 2/907 ; C21D 9/00 ; B21B 1/06 ;
U.S. Cl.
CPC ...
B32B 1/518 ; H01J 2/907 ; C21D 9/00 ; B21B 1/06 ;
Abstract
The present invention relates to a color cathode ray tube provided with a pressed-type shadow mask. As material for constituting the shadow mask , a single plate body made of a composite gradient alloy plate consisting of three layers A, B, C or more in which an alloy element has the concentration gradient which is continuously changed from one surface to the other surface is used. The present invention can realize a pressed mask having a large radius of curvature by self-correcting the thermal deformation such as a doming or the like.