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:
Jun. 09, 1981
Filed:
Oct. 11, 1979
Takeshi Tsuda, Takatsuki, JP;
Michio Kubota, Amagasaki, JP;
Kazuhiro Takagi, Amagasaki, JP;
Masahiro Shimose, Amagasaki, JP;
Yasuo Imamura, Urawa, JP;
Kazunori Kato, Tokyo, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Dai Nippon Printing Co. Ltd., Tokyo, JP;
Abstract
In process for manufacturing shadow mask of Braun tube for color TV comprising steps of subjecting strip of low carbon steel to cold rolling finish, forming holes in the rolled material, cutting it into individual flat masks, annealing each mask at elevated temperatures, conditioning the annealed mask and press-forming the mask into desired shape, the improvement residing in controlling the finish cold rolling reduction within the range between 10 and 35%, whereby the annealing temperature is reduced to 520.degree. to 750.degree. C. The process is applicable to steel strip material containing up to 0.10% by weight of carbon.