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. 17, 1977
Filed:
Jul. 16, 1975
Applicant:
Inventor:
Simon Larach, Princeton, NJ (US);
Assignee:
RCA Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
2523 / ;
Abstract
Phosphors consisting essentially of a host material having a face-centered cubic crystal structure and the empirical formula YTa.sub.3 O.sub.9 or Y.sub.3 TaO.sub.7 wherein 0.01 to 0.10 mol percent of the Y is replaced with at least one trivalent activator cation. A portion of the Y up to 20 mol percent may also be replaced with at least one trivalent nonactivator cation, such as Gd, La and Lu. The phosphors may be excited with ultraviolet light, x-rays or cathode rays to emit in the visible and ultraviolet regions of the spectrum depending on the excitation and the activator cations present.