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:
Mar. 21, 2006
Filed:
May. 16, 2003
Applicants:
Hiroyuki Umezawa, Ota, JP;
Masahiro Iseki, Ota, JP;
Motoyuki Tsuihiji, Ota, JP;
Hirofumi Iinuma, Ora-gun, JP;
Inventors:
Hiroyuki Umezawa, Ota, JP;
Masahiro Iseki, Ota, JP;
Motoyuki Tsuihiji, Ota, JP;
Hirofumi Iinuma, Ora-gun, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/52 (2006.01);
U.S. Cl.
CPC ...
Abstract
A filtering method is directed to a wastewater of CMP process, which includes sub-micrometer particles suspended as colloid. The wastewater is filtered by a gel membrane formed on a surface of plastic filter. A coagulant or a pH adjuster is added to the wastewater so that the sub-micrometer particles are coagulated to form the gel membrane.