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:
Jan. 16, 2001
Filed:
Feb. 12, 1999
Naoki Tsutsui, Yokosuka, JP;
Toshiba Lighting & Technology Corp., Tokyo, JP;
Abstract
A dual tube type fluorescent lamp including a luminescence tube. The luminescence tube has a long and slender airtight glass bulb with a nonlinear form part, a pair of electrodes and a phosphor layer formed on the inside surface of the glass bulb. A gap is formed between the circumference of the luminescence tube and an outside glass tube. The luminescence tube encloses an electric discharge medium coating mercury and a rare gas. An inorganic substance layer is formed at least at the nonlinear form part either on the outer surface of the luminescence tube, on the inner surface of the outside glass tube, or both. The inorganic substance layer has a softening point higher than the softening point of the glass.