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:
Apr. 19, 2005
Filed:
Jan. 30, 2002
Applicants:
Takashi Murata, Moriyama, JP;
Shinkichi Miwa, Kusatsu, JP;
Inventors:
Takashi Murata, Moriyama, JP;
Shinkichi Miwa, Kusatsu, JP;
Assignee:
Nippon Electric Glass Co., LTD, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C003/091 ; C03C003/093 ; C03C003/087 ;
U.S. Cl.
CPC ...
Abstract
An alkali-free glass consists essentially of, in mass percent, 58-70% SiO, 10-19% AlO, 6.5-15% BO, 0-2% MgO, 3-12% CaO, 0.1-5% BaO, 0-4% SrO, 0.1-6% BaO+SrO, 0-5% ZnO, 5-15% MgO+CaO+BaO+SrO+ZnO, 0-5% ZrO, 0-5% TiO, and 0-5% PO. The alkali-free glass contains substantially no alkali metal oxide and has a density of 2.45g/cmor less, an average coefficient of thermal expansion of 25×10/° C.-36×10/° C. within a temperature range between 30 and 380° C., and a strain point not lower than 640° C.