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. 30, 1991
Filed:
Oct. 02, 1990
Applicant:
Inventor:
Yeong Lin, Sunnyvale, CA (US);
Assignee:
Hoya Optics Inc., Fremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
501 48 ; 501 73 ; 501904 ;
Abstract
A green optical filter phosphate-based glass having a high near infrared, absorption at about 650 nm to 950 nm and a transmission peak transmission at 550 nm to 560 nm and with the steepest slope of the absorption curve occurring between about 570 nm to 650 nm. The glass composition comprising, in mol %: 50 to 60% P.sub.2 O.sub.5, O to 5% SiO.sub.2, 20 to 33% Li.sub.2 O, 0 to 25% Na.sub.2 O, 1 to 25% K.sub.2 O, 0 to 5% for each of CaO, Bao, SrO and MgO, 7 to 10% Al.sub.2 O.sub.3, 3 to 6% CuO, 0.5 to 1.6% Cr.sub.2 O.sub.3, 0.5 to 2.0% Ho.sub.2 O.sub.3, 0.5 to 2.0 Dy.sub.2 O.sub.3 and 0 to 2.0% Er.sub.2 O.sub.3.