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:
Feb. 22, 1994
Filed:
Nov. 27, 1991
Masaaki Tamatani, Fujisawa, JP;
Hidenori Ito, Yokosuka, JP;
Akira Taya, Kawasaki, JP;
Yoji Yuge, Chigasaki, JP;
Kazuaki Nakagawa, Urayasu, JP;
Shigeru Ando, Hiratsuka, JP;
Kenji Terashima, Chigasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
A fluorescent lamp characterized in that the charging tendency of a phosphor used is positioned more negative side than that of metal oxides each having a metal ion electronegativity X.sub.i of 7.0 but more positive side than that of metal oxides each having a metal ion electronegativity X.sub.i of 11.8, that particles of the phosphor are charged positive and smaller than 3.0 .mu.C per gram when they are in contact with soda lime glass beads each having a particle size of 200-500 .mu.m, or that they are charged negative and larger than -0.5 .mu.C per gram when they are in contact with reduced iron powder having a particle size of 44-74 .mu.m.