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:
Nov. 22, 1988
Filed:
May. 29, 1987
Applicant:
Inventor:
Robert D Shoup, Corning, NY (US);
Assignee:
Corning Glass Works, Corning, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
501 12 ; 501 54 ; 501 55 ; 2523132 ; 2523156 ; 423 78 ; 423338 ;
Abstract
Ultra-low thermal expansion TiO.sub.2 --SiO.sub.2 glasses are prepared using a sol-gel process wherein a stable alkali silicate solution comprising colloidal TiO.sub.2 and having a pH above 9 is gelled to form a semisolid silicate gel, the gel comprising homogeneously dispersed colloidal TiO.sub.2 but being essentially free of agglomerated TiO.sub.2 particles, washing the gel with aqueous media to remove alkali therefrom, and finally drying and consolidating the gel to a clear, void-free TiO.sub.2 --SiO.sub.2 glass which is substantially free of compositional inhomogeneities and has a thermal expansion coefficient below that of pure fused silica.