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:
Sep. 04, 2001
Filed:
Apr. 07, 2000
Applicant:
Inventors:
Marie M. J. Comte, Fontenay aux Roses, FR;
Paulo Marques, Sainte Genevieve des Bois, FR;
Assignee:
Corning S.A., Avon Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 3/066 ; C03C 3/068 ; C03C 3/072 ; C03C 3/074 ;
U.S. Cl.
CPC ...
C03C 3/066 ; C03C 3/068 ; C03C 3/072 ; C03C 3/074 ;
Abstract
The present invention relates to glasses of high refractive index having the following composition of oxides, expressed in percentages by weight: SiO,29-35, B,O,0.5-5, Li,O 0.5-3, Na,O 4-8, K,O 0-2, PbO 28-40, BaO 4-14, La,O,4-12, TiO,3-8, ZnO 0-8, ZrO,0-4, Nb,O,0-5, with: Li,O+Na,O+K,O 5.5-9; their use for the production of segments for multifocal corrective lenses; and multifocal corrective lenses incorporating at least one such segment in their structure.