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:
Jun. 08, 1976
Filed:
Aug. 21, 1975
Applicant:
Inventors:
William H Dumbaugh, Jr, Painted Post, NY (US);
Peter C Schultz, Painted Post, NY (US);
Assignee:
Corning Glass Works, Corning, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; C03C / ;
U.S. Cl.
CPC ...
428392 ; 106 52 ; 428428 ;
Abstract
A composite glass article is disclosed that is composed of a TiO.sub.2 --Al.sub.2 O.sub.3 --SiO.sub.2 glass core portion encompassed within a compressively stressed, vitreous silica-type glass exterior portion. The composite is strengthened by heat treatment within the ranges of 600.degree.C. to 900.degree.C. to effect a non-reversible contraction of the core glass at temperatures below the lowest glass strain point.