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:
Sep. 05, 1978
Filed:
Jan. 06, 1978
James E Flannery, Corning, NY (US);
Dale R Wexell, Corning, NY (US);
Corning Glass Works, Corning, NY (US);
Abstract
The present invention relates to glass articles which have compositions within the Li.sub.2 O-ZnO-PbO-B.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 -Al.sub.2 O.sub.3 system, which exhibit a dense white opal appearance, and which have good machinability characteristics. The latter property enables the articles to be sawed and drilled with hand tools without spalling or breakage and, in addition, to be polished to a relatively high gloss. The glasses are rendered opaque by their spearation into a lead oxide rich phase and a B.sub.2 O.sub.3 -SiO.sub.2 rich phase. The glasses may be converted to glass-ceramic materials, either before or after machining, if desired.