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:
May. 05, 1981
Filed:
Apr. 25, 1980
Yoshirou Ikeda, Nishinomiya, JP;
Yoshikazu Kaite, Nishinomiya, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
A step-type light-transmitting body having excellent water resistance, said light-transmitting body comprising a core material of a glass having the following composition in % by weight: (1) SiO.sub.2 15-40, (2) ZrO.sub.2 8-17, (3) B.sub.2 O.sub.3 5-15, (4) BaO 30-45, (5) Na.sub.2 O 3-15, as essential ingredients, and (6) GeO.sub.2 0-30, TiO.sub.2 0-3, Al.sub.2 O.sub.3 0-5, La.sub.2 O.sub.3 0-5, MgO 0-5, CaO 0-7, ZnO 0-7, SrO 0-5, Li.sub.2 O 0-8, K.sub.2 O 0-10, Rb.sub.2 O 0-5, and Cs.sub.2 O 0-8, as additional ingredients; provided that SiO.sub.2 +GeO.sub.2 15-50, ZrO.sub.2 +BaO 38-55, Na.sub.2 O+Li.sub.2 O+K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O 5-15, and MgO+CaO+ZnO+SrO+TiO.sub.2 +Al.sub.2 O.sub.3 +La.sub.2 O.sub.3 0-12. In the above composition, the amounts of (2) ZrO.sub.2, (3) B.sub.2 O.sub.3, (5) Na.sub.2 O and ZrO.sub.2 + BaO may be changed to 8-15, 7-12, 5-12, and 38-50, respectively.