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:
Apr. 17, 1979
Filed:
Sep. 11, 1978
Jean E Boudot, Avon, FR;
Henri J Meyer, Avon, FR;
Corning Glass Works, Corning, NY (US);
Abstract
The instant invention relates to glasses suitable for optical and ophthalmic applications which can be melted and formed utilizing continuous commercial processes. The glasses exhibit indices of refraction between about 1.675-1.720, densities between about 3.1-3.4 g/cm.sup.3, Abbe numbers between about 33-36.5, viscosities at the liquidus temperature of at least about 220 poises, and very high chemical durability as evidenced by a loss of weight of less than 0.01 mg/cm.sup.2 in the American Optical test. The glasses consist essentially, in weight percent on the oxide basis, of 40-46% SiO.sub.2, 0-3% Al.sub.2 O.sub.3, 40-46% SiO.sub.2 +Al.sub.2 O.sub.3, 13-17% TiO.sub.2, 4-11% ZrO.sub.2, 0-2% MgO, 3-7% CaO, 4-8% CaO+MgO, 8-16% BaO, 0-4% SrO, 15-25% CaO+BaO+SrO, 2-10% Nb.sub.2 O.sub.5, 0-3% Li.sub.2 O, 2-7% Na.sub.2 O, 3-8% K.sub.2 O, 5-12% Li.sub.2 O+Na.sub.2 O+K.sub.2 O.