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. 08, 2001
Filed:
Dec. 02, 1998
Applicant:
Inventors:
Assignee:
Matsushita Electronics Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/62 ; H01J 5/50 ;
U.S. Cl.
CPC ...
H01J 1/62 ; H01J 5/50 ;
Abstract
A fluorescent lamp includes a glass bulb whose inner surface is coated with a fluorescent substance, a glass bead attached to an end of the glass bulb so as to seal the glass bulb, an exhaust tube provided in the glass bead and sealed, a filament coil arranged in an internal portion of the glass bulb, and an electrode terminal member electrically connected to the filament coil. The glass bead controls a position of the electrode terminal member. The glass bulb preferably contains 5 to 10 wt % of Na,O. The glass bulb, the glass bead and the exhaust tube preferably have a lead-free composition.