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. 09, 1995
Filed:
Sep. 14, 1993
Donald M McPherson, Oakland, CA (US);
Other;
Abstract
Rare earth ions with partially filled 4f electron shells are incorporated in an amount of up to 39 mole percent oxide into a glass consisting essentially of, in mole percent, 19-31% SiO.sub.2, 19-31% B.sub.2 O.sub.3, 10-20% Al.sub.2 O.sub.3, 2-10% amounts of SiO.sub.2 and B.sub.2 O.sub.3 should be greater than about 40%, and the amounts of Al.sub.2 O.sub.3, ZrO.sub.2 and Y.sub.2 O.sub.3 are greater than about 12%. The glass can also include about 0.1 to 5% mole percent of FeO, ZnO or both. Suitable rare earth ions include but are not limited to, Er.sup.3+, Nd.sup.3+, Dy.sup.3+, and Sm.sup.3+. Optionally, the glass can be color corrected to neutral for a wide range of illuminant sources by the addition of one or more of the following: Cr.sub.2 O.sub.3, Pr.sub.2 O.sub.3, Fe.sub.2 O.sub.3, CuO, NiO, V.sub.2 O.sub.5, Co.sub.3 O.sub.4 or Ti.sub.2 O.sub.3. These glass compositions are useful as absorption filters. In one embodiment, the composition selectively absorbs at 1064 and 532 nm.