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. 28, 1978
Filed:
Mar. 02, 1977
Carr L Quackenbush, Lexington, MA (US);
Andrew G Kolbeck, Beverly, MA (US);
Richard M Klein, Framingham, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
Novel glass compositions are provided which are enclosed by the iso-composition lines, 2 and 18 mole percent P.sub.2 O.sub.5, 30 and 70 mole percent Al.sub.2 O.sub.3 and 20 and 60 mole percent B.sub.2 O.sub.3. The compositions can contain the usual oxide modifiers. These composition are characterized by refractive indices between about 1.47 and 1.58, densities between about 2.1 and 2.7 gm/cm.sup.3, thermal expansion coefficients between about 26 .times. 17.sup.-7 /C.degree. and 55 .times. 10.sup.-7 /C.degree., and glass transition points of between about 600 and 820.degree. C.