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:
Nov. 09, 2004
Filed:
May. 31, 2002
Toshihide Murakami, Chiba, JP;
Tsunehiko Sugawara, Chiba, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A glass bulb for a color cathode ray tube, which comprises a panel, a funnel connected to the panel and a neck, the panel comprising a face portion and a skirt portion constituting a side wall of the face portion and having a seal edge portion at the end portion, wherein such a compressive stress &sgr; that 50 MPa≦|&sgr; |≦250 MPa is produced by an ion-exchange method to at least one of short axis end portions and long axis end portions on the outer surface of the face portion; the average thickness t=(t +t )/2 of the face portion represented by the central thickness t of the face portion and the maximum thickness t of the face portion, and the thickness t at the seal edge portion, satisfy the relation t/t ≦1.4; and the maximum value &sgr; of the tensile stress generated at the face portion when vacuumized is 20 MPa≦&sgr; <200 MPa.