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:
Dec. 28, 1976
Filed:
Apr. 27, 1976
Applicant:
Inventors:
Marga Faulstich, Mainz, D;
Georg Gliemeroth, Finthen, D;
Assignee:
Jenaer Glaswerk Schott & Gen., Mainz, D;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
106 53 ; 106 / ;
Abstract
Glass as near-portion material for fusion with known phototropic far-portion glasses for multifocal spectacle lenses has a linear thermal expansion coefficient between 45 and 58 .times. 10.sup.-.sup.7 /.degree. C, a refractive index of n.sub.d .gtoreq.1.60, a speed of crystallization of less than 0.5 .mu./min., and the following composition: