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. 15, 1991
Filed:
Feb. 09, 1990
Applicant:
Inventors:
Yoshiharu Miwa, Shiga, JP;
Kazuhiko Asahi, Shiga, JP;
Assignee:
Nippon Electric Glass Co., Ltd., Otsu, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ; C03C / ; C03C / ;
U.S. Cl.
CPC ...
501 53 ; 501 55 ; 501 60 ; 501 61 ; 501 65 ;
Abstract
A radiation shielding glass consisting esentially of 40.0% to 60.0% SiO.sub.2, 25.0% to 45.0% of PbO, 1.5% to 2.0% CeO.sub.2, 4.5% to 12.0% Na.sub.2 O, 2.0% to 9.0% K.sub.2 O, 0% to 5.0% B.sub.2 O.sub.3, and 0% to 10.0% BaO, Na.sub.2 O/(Na.sub.2 O+K.sub.2 O) being 0.5 to 0.8. The glass has a high radiation shielding capacity and is excellent in a resistance to browning by the gamma ray irradiation and an improved dielectric breakdown. The glass is useful for a window glass of an irradiation room of the gamma ray.