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:
Nov. 03, 1992
Filed:
Dec. 09, 1991
Applicant:
Inventors:
Arunava Dutta, Chestnut Hill, MA (US);
Leonard V Dullea, Peabody, MA (US);
Assignee:
GTE Products Corporation, Danvers, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C09K / ;
U.S. Cl.
CPC ...
2523 / ; 423 211 ; 423263 ;
Abstract
A fluorescent lamp phosphor product is recovered from a degraded aqueous suspension by treating a separated solids portion of the suspension with nitric acid to solubilize a decomposed portion of a rare earth activated yttrium oxide phosphor and form a remaining mixture of phosphors which may be reconstituted to a fluorescent lamp phosphor product suitable for use in a lamp.