May C Wu

US Patent:

6699684, Mar 2, 2004

Filed:

Jul 23, 2002

Appl. No.:

10/201088

Inventors:

Bosco P. Ho - Wheaton IL
May W. Wu - Lisle IL
E. H. Kelle Zeiher - Naperville IL
Mita Chattoraj - Warrenville IL

Assignee:

Nalco Company - Naperville IL

International Classification:

A01N 100

US Classification:

435 29, 435 4, 435968

Abstract:

Methods for monitoring and/or controlling biofouling in membrane separation systems are provided. The present invention utilizes measurable amounts of fluorogenic agent(s) added to a feed stream to monitor and/or control the level of microbial growth during membrane separation and, thus, the purification of such feed stream during membrane separation.

US Patent:

6818417, Nov 16, 2004

Filed:

Aug 6, 2002

Appl. No.:

10/213682

Inventors:

Andrew J. Cooper - Oswego IL
Michael V. Enzien - Lisle IL
Steven R. Hatch - Naperville IL
Bosco P. Ho - Lombard IL
May M. Wu - Lisle IL

Assignee:

Nalco Company - Naperville IL

International Classification:

C12Q 102

US Classification:

435 29, 210708, 435 39, 436529, 436531, 436546, 436800, 5303913, 5303915, 530402

Abstract:

A method for locating hidden microorganism contaminated surfaces in industrial water systems is described and claimed. The method works by applying a solution or dispersion of a fluorogenic reagent in water to the hidden water contact surfaces of said industrial water system and allowing said fluorogenic reagent to react with any hidden microorganisms present, wherein said fluorogenic reagent is selected from the group of fluorogenic reagents that are known to react with microorganisms such that a fluorescent signal of said fluorogenic reagent is detectable in such a way as to make the detection of the fluorescent signal indicate that there are hidden microorganisms present on the water contact surfaces of the equipment and piping.

US Patent:

20040115757, Jun 17, 2004

Filed:

Nov 25, 2003

Appl. No.:

10/721667

Inventors:

Bosco Ho - Wheaton IL, US
May Wu - Lisle IL, US
E. H. Zeiher - Naperville IL, US
Mita Chattoraj - Warrenville IL, US

International Classification:

C12Q001/04

US Classification:

435/034000

Abstract:

Methods for monitoring and/or controlling biofouling in membrane separation systems are provided. The present invention utilizes measurable amounts of fluorogenic agent(s) added to a feed stream to monitor and/or control the level of microbial growth during membrane separation and, thus, the purification of such feed stream during membrane separation.

US Patent:

20040203088, Oct 14, 2004

Filed:

Dec 18, 2003

Appl. No.:

10/740336

Inventors:

Bosco Ho - Aurora IL, US
May Wu - Lisle IL, US
Mita Chattoraj - Warrenville IL, US

International Classification:

C12Q001/04

US Classification:

435/034000

Abstract:

Methods for monitoring and controlling biofouling in membrane separation systems are provided. The present invention uses measurable amounts of fluorogenic agent(s) added to a feed stream to monitor and control the level of microbial growth during membrane separation and, thus, the purification of such feed stream during membrane separation.

US Patent:

60962259, Aug 1, 2000

Filed:

Sep 11, 1998

Appl. No.:

9/151637

Inventors:

Shunong Yang - Naperville IL
Michael V. Enzien - Aurora IL
May M. Wu - Tinley Park IL
William F. McCoy - Naperville IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C02F 150

US Classification:

210755

Abstract:

A method is disclosed for controlling biofouling in an aqueous medium by treating the aqueous medium with an oil-in-water emulsion comprising an antimicrobial oil phase and at least one emulsifier. This method efficiently controls biofouling in the aqueous medium by specifically targeting the antimicrobial oil phase directly to biofilms, cell surfaces and cell aggregates in a concentrated form.