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. 20, 1977
Filed:
May. 22, 1974
Applicant:
Inventors:
Judicus Marinus Verstegen, ALL OFEindhoven, NL;
Willebrordus Hubertus VAN DE Spijker, ALL OFEindhoven, NL;
Emiel Petrus DE Meester, ALL OFEindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; H01J / ;
U.S. Cl.
CPC ...
313486 ; 2523 / ; 428532 ; 428539 ;
Abstract
A luminescent beryllium-containing phosphate activated by bivalent europium defined by the formula Me.sub.a-x Be.sub.b Eu.sub.x P.sub.2 O.sub.8 where a + b = 3 and 0.01.ltoreq.x.ltoreq.0.25 and b has the value 1 or 2. If b = 2, Me mainly represents one of the alkaline earth metals barium, strontium and calcium. If b = 1, Me mainly represents barium and/or strontium. The luminescent phosphate may be used in mercury vapor discharge lamps and in low-pressure cadmium vapor discharge lamps.