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:
Apr. 08, 2003
Filed:
Jul. 05, 2001
Hiroshi Ito, Mobara, JP;
Nobuhiko Hosotani, Mobara, JP;
Mitsuru Watanabe, Chousei-gun, JP;
Haruhiko Yoshida, Sakura, JP;
Hitachi Ltd., Tokyo, JP;
Abstract
A color cathode ray tube includes a shadow mask having an apertured portion, an imperforate portion and a skirt portion. The shadow mask of an iron-nickel alloy is suspended within a support frame, has a descending step portion around the imperforate portion, the skirt portion which is fitted in the support frame is integral with the descending step portion, is provided with plural beads parallel with a height of the skirt portion and protruding inward. The descending step portion satisfies one of conditions (a)-(c) of (a) its height is from 30% to of H , (b) its width is from 65% to 80% of W , or (c) its height H and width W are from 30% to 50% of H and from 65% to 80% of W , respectively, where H and W are its height and width at centerlines of long and short sides of the skirt portion, respectively.