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. 16, 1991
Filed:
Jul. 12, 1989
Applicant:
Inventor:
Samuel A Carleton, Bath, NY (US);
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313 25 ; 313560 ; 315 73 ;
Abstract
The invention relates to a high-pressure sodium discharge lamp provided with a discharge vessel having a longitudinal axis 1 and a diameter D. The discharge vessel is enclosed by an outer envelope. Within the outer envelope a starting circuit is arranged, which has at least a glow starter. According to the invention, the outer envelope is a clear outer envelope and the glow starter is arranged so as to be laterally displaced over a distance of at least D/2 with respect to the discharge vessel. Moreover, the glow starter is shielded for the major part with respect to the discharge vessel by means of a heat shield.