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:
Dec. 03, 2002
Filed:
Apr. 30, 1999
Applicant:
Inventors:
Akira Makita, Tokyo, JP;
Takahito Aoki, Tokyo, JP;
Assignee:
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 2/981 ; H01J 2/907 ;
U.S. Cl.
CPC ...
H01J 2/981 ; H01J 2/907 ;
Abstract
A shadow mask for a color picture tube that is made of an iron-base alloy material containing nickel and has a low coefficient of thermal expansion. The iron-base alloy material has 0.2% proof stress of from 220 to 300 N/mm . The grain size number measured in conformity to JIS G0551 is not more than 7.5. The degree of texture in each plane measured by X-ray diffraction method is not more than 20%. The difference between the degree of texture in each plane and that in any other plane is not more than 20%. The shadow mask is produced by press forming without undergoing annealing before the press forming.