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:
Oct. 22, 2002
Filed:
Sep. 21, 1999
Applicant:
Inventors:
Toshiharu Narita, Otsu, JP;
Hiroki Yamazaki, Shiga, JP;
Assignee:
Nippon Electric Glass Co., Ltd., Otsu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 3/091 ; C03C 3/093 ; C03C 3/11 ;
U.S. Cl.
CPC ...
C03C 3/091 ; C03C 3/093 ; C03C 3/11 ;
Abstract
An alkali-free glass essentially consists of, by weight percent, 40-70% SiO , 6-25% Al O , 5-20% B O , 0-10% MgO, 0-15% CaO, 0-30% BaO, 0-10% SrO, 0-10% ZnO, 0.05-2% SnO , and 0.005-1% Cl , and substantially contains no alkali metal oxide.