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:
Apr. 04, 1978
Filed:
Jun. 09, 1977
Applicant:
Inventors:
Dominic T Palumbo, deceased, late of Towanda, PA (US);
Francis N Shaffer, Towanda, PA (US);
Assignee:
GTE Sylvania Incorporated, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
2523 / ; 2523015 ;
Abstract
Luminescent materials, having the formula, M.sub.(3+x) WO.sub.(6+x) : yMn wherein M is an alkaline earth metal selected from the group consisting of calcium, barium and strontium, x has a value of from 0 to about 0.4 and y has a value of from 0.00005 to about 0.05, emit light at a wave length of from about 650 to about 750 nanometers when excited by long wave length ultraviolet light. The above phosphors are prepared by heating the desired decomposable alkaline earth metal salt, a manganese source and tungsten trioxide in air and under controlled temperature conditions.