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:
Jul. 24, 1979
Filed:
Aug. 09, 1978
Ramon L Yale, Ulster, PA (US);
GTE Sylvania Incorporated, Stamford, CT (US);
Abstract
Rare earth activated rare earth fluorogermanates, represented by the formula: [R.sub.1.sbsb.x R.sub.2.sbsb.(1-x) ].sub.a F.sub.b GeO.sub.C wherein x is a value from about 0.9 to about 0.9998, a is a value of from about 2 to about 4, b is from about 0.85 to about 3.15, c is from about 4 to about 7.5 R.sub.1 is selected from the group of Y, Gd and La and R.sub.2 is selected from Eu, Gd, Tb and Pr and R.sub.1 and R.sub.2 are different, are excited by long or short wavelength ultraviolet light. A solid state process for using a blend of the metal oxides and a heat-decomposable fluorine compound is disclosed along with a preferred embodiment wherein the dual rare earth oxide is formed prior to forming the aforementioned blend of metal oxides.