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:
Feb. 18, 1992
Filed:
Dec. 26, 1990
Applicant:
Inventors:
Kuniko Ando, Hadano, JP;
Koichi Shiraishi, Hadano, JP;
Masaru Shimbo, Yokohama, JP;
Shunzo Shimai, Tougane, JP;
Assignee:
Toshiba Ceramics Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
210496 ; 55487 ; 55523 ; 21050026 ; 210503 ; 2105101 ; 264112 ; 264113 ; 264D / ; 4283126 ; 428325 ; 428332 ; 428426 ; 428428 ;
Abstract
A silica glass filter comprises a porous support body composed of amorphous silica particles as a porous sintered body and having a purity of 99.9% or more and containing 150 ppm or less in total of impurities including alkali, alkali metal, heavy metal and/or elements of III B group, and a filtration layer formed on the support body. The filtration layer is composed of amorphous silica particles as a porous sintered body in a fine mode and has substantially the same purity as that of the support body.