Wastewater treatment process

Patent 7468137 Issued on December 23, 2008. Estimated Expiration Date:

November 7, 2025. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2217466

Polymeric basic aluminum silicate-sulphate
Patent #: 5069893
Issued on: 12/03/1991
Inventor: Haase, et al.

Flocculant for water treatment
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Inventor: Hasegawa, et al.

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Method of water treatment using zeolite crystalloid coagulants Patent #: 6190561
Issued on: 02/20/2001
Inventor: Nagan

Inventors

Assignee

Fuji Xerox Co., Ltd.

Application

No. 11267277 filed on 11/07/2005

US Classes:

210/705Chemically specified precipitant, coagulant, or flocculant

Examiners

Primary: Hruskoci, Peter A.

Attorney, Agent or Firm

OLiff & Berridge, PLC

Foreign Patent References

7-136408 JP 05/01/1995
9-225474 JP 09/01/1997
A 11-216478 JP 08/01/1999

International Class

C02F 1/52

Abstract

A wastewater treatment process for treating wastewater comprising a water-based dispersion containing a surfactant, a colorant and silica, as well as other solid matter, wherein the wastewater is treated using a polysilicato-iron coagulant.

Other References

Excerpt of the 5^thEdition of “Technology and Regulations for Pollution Prevention (Water Resources Edition)”, edited by the environmental Protection and Industrial Location Bureau, Ministry of International Trade and Industry, published 2001 (p. 140-153 and 182 & 183) with Partial English Translations.