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:
May. 11, 1976
Filed:
Jan. 06, 1975
Judicus Marinus Verstegen, Eindhoven, NL;
Willebrordus Hubertus VAN DE Spijker, Eindhoven, NL;
Cornelis Wilhelmus Schetters, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A luminescent screen, particularly for a low-pressure mercury vapor discharge lamp, provided with a luminescent thallium-activated aluminate having the .beta.-alumina structure and defined by the formula (Me.sup.I.sub.1.sub.-x.sub.-p Tl.sub.x Me.sup.II.sub.p) (Al.sub.11.sub.-y Mn.sub.y)O.sub.17 in which Me.sup.I represents at least one of the alkali metals sodium, potassium and rubidium, and in which Me.sup.II represents at least one of the alkaline earth metals calcium, strontium and barium, in which up to 50 mol % of aluminum may be replaced by gallium, and in which