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. 23, 2002
Filed:
Jan. 04, 2001
Nozomu Arimoto, Osaka, JP;
Hayato Kita, Niigata, JP;
Masahiro Aoki, Niigata, JP;
Shinji Tsuge, Hyogo, JP;
Kazuhiko Adachi, Niigata, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A stainless steel plate for a shadow mask, comprising 9 to 20 weight % of chromium (Cr), 0.15 weight % or less of carbon (C), 0 to 1.0 weight % of manganese (Mn), 0 to 0.2 weight % of titanium (Ti), 0 to 1.0 weight % of silica (Si), and 0 to 1.0 weight % of aluminum (Al); wherein the rest includes ferrite (Fe) and inevitable impurities, and in the inevitable impurities, the content of phosphor (P) is 0.05 weight % or less and the content of sulfur (S) is 0.03 weight % or less. Furthermore, the metal plate for a shadow mask after cold rolling or shape correction is performed is subjected to annealing treatment at the end-point temperature of the plate of 550 to 650° C. This steel plate has a coefficient of thermal expansion smaller than that of low carbon steel and is less expansive than invar alloy. Further, the steel plate has high strength that is acceptable for the shadow mask that is used under conditions where plastic deformation is small at high temperature and high tension is applied. Furthermore, the steel plate has an excellent etching processing property.