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:
Aug. 30, 1977
Filed:
Aug. 31, 1972
Applicant:
Inventors:
Louis Eugene Vrenken, Eindhoven, NL;
Pieter Hendrik Broerse, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F21V / ;
U.S. Cl.
CPC ...
240 4603 ; 240 4617 ; 240 / ; 315294 ;
Abstract
In a lighting fitting provided with at least two low-pressure mercury vapor discharge lamps whose radiated light has a different spectral composition. The lighting fitting is provided with apparatus to control the lumen ratio of the two lamps without varying the lumen level of the fitting. According to the invention low-pressure mercury vapor discharge lamps are used in the fitting which, inter alia as regards their color point, satisfy special requirements so that the color rendition obtained with these lamps is always of a high quality for each mixing ratio of the light from these lamps.