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. 11, 2004
Filed:
Jun. 05, 2002
Tsunehiko Sugawara, Chiba, JP;
Yutaka Segawa, Chiba, JP;
Ryuichi Tanabe, Kanagawa, JP;
Eiji Ichikura, Kanagawa, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
The present invention relates to a color cathode ray tube and a glass frit to be used for it, and provides a color cathode ray tube which uses a glass frit containing as a crystallizing filler, an &agr;-4PbO.B O crystal powder and/or a Pb O crystal powder, and corpuscular &agr;-alumina, and at least one member selected from the group consisting of MgO, Fe O and monoclinic ZrO , for improvement of the strength at a sealed portion and for weight saving of the color cathode ray tube, wherein the maximum tensile stress generated at the above sealed portion is from 7 to 10 MPa when the inside is vacuumized, and the area ratio of crystal is at least 50% at the interface at the above sealed portion at at least the region at which the above maximum tensile stress is generated.