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:
Sep. 22, 2009
Filed:
May. 17, 2005
Thomas Justel, Witten, DE;
Walter Mayr, Alsdorf, DE;
Helmut Bechtel, Roetgen, DE;
Peter Schmidt, Aachen, DE;
Thomas Justel, Witten, DE;
Walter Mayr, Alsdorf, DE;
Helmut Bechtel, Roetgen, DE;
Peter Schmidt, Aachen, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The invention is concerned with a low-pressure mercury vapor discharge lamp comprising a light-transmitting discharge vessel, said discharge vessel enclosing, in a gastight manner, a discharge space provided with a filling of mercury, at least a part of a wall of the discharge vessel being provided with a luminescent composition comprising a first UV-A phosphor of general formula (GdYLu)PO:Ce, wherein 0≦x<1.0, 0≦y<1.0, 0<z≦0.2 and x+y+z<1, the low-pressure mercury vapor discharge lamp comprising also discharge means for igniting and maintaining an electric discharge in the discharge vessel. Such lamp is especially useful for tanning purposes as well as cosmetic and medical purposes. The invention is also concerned with an UV-A phosphor of general formula (GdYLu)PO:Ce, wherein 0≦x<1.0, 0≦y<z≦0.2 and x+y+z<1.