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:
Mar. 10, 1981
Filed:
Nov. 05, 1979
Richard F Reade, Corning, NY (US);
Corning Glass Works, Corning, NY (US);
Abstract
This invention is concerned with the production of glasses in the Li.sub.2 O-PbO-Al.sub.2 O.sub.3 -SiO.sub.2 system which resist the development of devitrification at temperatures approaching the softening point of the glass, which resist surface wrinkling, haze, devitrification, spalling, and cracking when held for several hours at temperatures above the annealing point of the glass but below the softening point thereof, which can be chemically strengthened to demonstrate modulus of rupture values in excess of 60,000 psi, which display excellent chemical durability, and which, in the most preferred embodiment, exhibit a refractive index of 1.523. Such glasses consist essentially, expressed in terms of weight percent on the oxide basis as calculated from the batch, of