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:
Dec. 18, 1990
Filed:
Aug. 15, 1989
Applicant:
Inventors:
Keisuke Wada, Yokohama, JP;
Yasushi Tsurita, Tokyo, JP;
Assignee:
Mitsubishi Kasei Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ;
U.S. Cl.
CPC ...
501 39 ; 501 55 ; 501 54 ;
Abstract
Porous glass consisting essentially of silica, zicronia and an alkali metal compound, wherein the content of zirconia is at least 5% by weight and the content of the alkali metal compound is at least 2% by weight as calculated as M.sub.2 O wherein M is an alkali metal element, and the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 0.2 ml/g. and the proportion of the pore volume (B) of pores having pore radii of from 100 to 10,000 .ANG. to the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 80%.