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:
Apr. 07, 1992
Filed:
Feb. 26, 1991
Katsuhide Misono, Yokohama, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
A fluorescent lamp of a hot cathode type which is operated with a lamp current of 50 mA or less comprises an outer tube as an envelop, a gas filled in the envelop and a pair of electrodes disposed at both ends of the outer tube in an opposing fashion, at least one of the electrodes being operated in a hot cathode mode. With the fluorescent lamp of the type described, a following relationship is established, p.d.gtoreq.13, where d represents an inner diameter (cm) of the envelop and p represents an inner pressure (Torr) of the gas filled in the envelop. When the relationship V.sub.k .ltoreq.15, where V.sub.k represents a cathode fall voltage, is further satisfied, the life time of the fluorescent lamp can be elongated.