Patent · US Expired

Spontaneous opal glasses

US4080215A · kind A · utility

0Cited by

4References

5Claims

0Family size

Assignee

Corning Glass Works · US

Inventors

David C. Boyd · Somerville, US
William H. Dumbaugh, Jr. · Corning, US
James E. Flannery · Corning, US

Key dates

Filing date	Apr 4, 1977
Grant date	Mar 21, 1978
Priority date	—
Expiry date	Apr 4, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C3/118
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

This invention is concerned with spontaneous opal glasses wherein sodium fluoride (NaF) and strontium fluoride (SrF.sub.2) constitute the predominant opacifying phases. More specifically, the opal glasses of the instant invention have compositions within the Na.sub.2 O--SrO--Al.sub.2 O.sub.3 --SiO.sub.2 --F field and exhibit a dense white appearance, a softening point above 755.degree. C., a strain point in excess of 500.degree. C., a coefficient of thermal expansion (0.degree.-300.degree. C.) in excess of 65.degree. .times. 10.sup.-7 /.degree. C., and satisfactory resistance to weathering and dishwasher environments.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.