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:
Aug. 02, 1977
Filed:
Nov. 26, 1975
Thomas H Elmer, Corning, NY (US);
Richard E Tischer, Corning, NY (US);
Corning Glass Works, Corning, NY (US);
Abstract
The present invention relates to a method of producing a borosilicate glass exhibiting a low coefficient of thermal expansion, viz., less than about 20 .times. 10.sup..sup.-7 /.degree. C. over the range of room temperature to 300.degree. C., an ability to withstand repeated thermal cycling between room temperature and temperatures up to 1300.degree. C. and higher without devitrification, and the ability to flow, when present in particulate form, at temperatures between about 1000.degree.-1250.degree. C. The method contemplates impregnating a porous, essentially alkali metal-free, high silica material with a solution or a molten mass of a B.sub.2 O.sub.3 -containing compound, the B.sub.2 O.sub.3 -containing compound also being essentially free from alkali metals. The impregnated glass is thereafter dried to eliminate any solvent. High emissivity can be imparted by incorporating minor amounts of such materials as CoO, NiO, MoO.sub.3, Fe.sub.2 O.sub.3, and V.sub.2 O.sub.5 as dopants during the impregnation step. The impregnated material is especially useful as a glaze to provide an impervious coating on high purity silica insulating tiles.