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:
May. 12, 1987
Filed:
May. 17, 1984
Applicant:
Inventors:
Michihiko Inaba, Kanagawa, JP;
Masaharu Kanto, Hyogo, JP;
Satoshi Shikanai, Kanagawa, JP;
Yasuhisa Ohtake, Saitama, JP;
Assignee:
Kabushiki Kaisha Toshiba, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313402 ; 313407 ;
Abstract
A front end element, such as a shadow mask, for a color cathode ray tube is made from an alloy including iron and nickel as its principal components; and a black oxide layer is formed integrally on the alloy base. The black oxide layer consists essentially of a spinel-type oxide with the formula Ni.sub.x Fe.sub.(3-x) O.sub.4, where x is a positive number less than 3. A front end element constructed in this way produces a higher quality picture because of reduced thermal expansion.