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. 05, 1989
Filed:
Nov. 30, 1987
Applicant:
Inventors:
Shinzo Sugai, Yokohama, JP;
Fumio Mori, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313402 ;
Abstract
Disclosed is an Invar alloy original sheet for use in the production of a shadow mask, wherein the Invar alloy original sheet has the cleanliness measured by the method regulated in JIS G 0555, of 0.07% or less. Disclosed is also a shadow mask comprising an Invar alloy original sheet having the cleanliness mentioned above. By use of the Invar alloy original sheet of this invention, the problem of non-uniformity and irregurarity of inner wall surface of perforations formed on the original sheet for shadow mask is decreased to a great extent.