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:
Jul. 07, 1987
Filed:
May. 23, 1985
Miklos Csapody, Budapest, HU;
Tungsram Rt., Budapest, HU;
Abstract
The invention relates to a high pressure sodium vapor lamp having improved color reproduction index, which has a discharge vessel (1) placed in an outer envelope (10) and at least a pair of electrodes (4,5) and a filling comprising of at least one additive material and a fill gas, as well as a pair of current conductors (6,7) for supplying current for the electrodes (4,5). The essence of the invention resides in that especially in the case of high pressure sodium vapor lamps of low output for the increasing of the color reproduction index filaments (2,3) are arranged at the ends and outside of the discharge vessel (1) and which during the entire operation of the discharge vessel (1) are connected in series therewith.