David T Workman

US Patent:

6440689, Aug 27, 2002

Filed:

Jun 28, 2001

Appl. No.:

09/894929

Inventors:

Rodney H. Banks - Aurora IL
Nancy L. Casselman - Aurora IL
Mita Chattoraj - Warrenville IL
Ronald V. Davis - Geneva IL
Michael J. Fehr - Geneva IL
Sasireka S. Ramesh - Aurora IL
David P. Workman - Naperville IL

Assignee:

Ondeo Nalco Company - Naperville IL

International Classification:

C12Q 102

US Classification:

435 29, 435968, 435 4

Abstract:

A method for monitoring the microbiological contamination of opaque media is described and claimed. In this method, a Fluorogenic Dye is added to an Aliquot of opaque medium. After a certain time period, a fluorometer capable of measuring fluorescent signals in an opaque medium is used to measure the fluorogenic signals of the Fluorogenic Dye and the Reacted Fluorogenic Dye. A Useful RATIO of the fluorescent signal of the Reacted Fluorogenic Dye to the fluorescent signal of the Fluorogenic Dye is calculated and the information gleaned from the RATIO is used to ascertain the state of microbiological contamination in the opaque medium.

US Patent:

6461518, Oct 8, 2002

Filed:

Oct 30, 2000

Appl. No.:

09/699672

Inventors:

Konstantinos Demadis - Glen Ellyn IL
Douglas G. Kelley - Naperville IL
David P. Workman - Naperville IL
Mingli Wei - Naperville IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C02F 512

US Classification:

210698, 252180, 252392, 422 16

Abstract:

This invention relates to a method for inhibiting the formation and deposition of silica scale in water systems. The method includes treating the water in such water systems with an effective amount of a polyamide that contains secondary amine and/or ether and amide functional groups.

US Patent:

20050004236, Jan 6, 2005

Filed:

Jul 1, 2003

Appl. No.:

10/610687

Inventors:

David Workman - Naperville IL, US
Ronald Doles - LaGrange Park IL, US

International Classification:

C01B033/141
B32B021/12

US Classification:

516080000, 428452000

Abstract:

Silica particle agglomerates prepared by adding an aluminum phosphate agglomerating agent with mixing to an aqueous dispersion of colloidal silica particles to form an aqueous homogeneous dispersion of silica particles and agglomerating agent and then adjusting the pH of the dispersion with mixing to about 3.5 to about 8.5 to produce the agglomerated silica particles and use of the agglomerates to prepare an ink receptive coating, as catalysts, as reinforcing fillers and as flattening agents.

US Patent:

20050178070, Aug 18, 2005

Filed:

Jun 30, 2004

Appl. No.:

10/880910

Inventors:

David Workman - Naperville IL, US
Michael Romba - Joliet IL, US
Ronald Doles - LaGrange Park IL, US

International Classification:

B01J002/28
B24D003/02
C04B014/04

US Classification:

051307000, 02331300R, 106483000, 106287170, 051309000, 051308000, 106426000, 106442000, 106450000, 106459000

Abstract:

Metal oxide particle agglomerates prepared by adding an aluminum phosphate agglomerating agent with mixing to an aqueous dispersion of metal oxide nanoparticles to form an aqueous homogeneous dispersion of nanoparticles and agglomerating agent and then adjusting the pH of the dispersion with mixing to about 3.5 to about 6.5 to produce the particle agglomerates and use of the particle agglomerates to prepare ink receptive coatings, as catalysts, as reinforcing fillers, as polishing abrasives and as flattening agents.

US Patent:

20070231249, Oct 4, 2007

Filed:

Apr 4, 2006

Appl. No.:

11/397134

Inventors:

Francois Batllo - Burr Ridge IL, US
Brian Holland - Oak Park IL, US
John Krasniewski - Charlotte NC, US
Kim Long - Naperville IL, US
Michael Romba - Joliet IL, US
Sascha Welz - Chicago IL, US
David Workman - Naperville IL, US

International Classification:

C01B 33/26

US Classification:

423592100, 423328100, 423335000, 977811000

Abstract:

A method of preparing a particulate material comprising the steps of adding silicic acid solution, optionally doped with aluminum, optionally added to a slurry of pre-existing nanoparticles at a neutral to slightly acidic pH of no more than seven, and at a temperature of about 20 to 30 C. This yields a polysilicate particulate dispersion. Then, the pH of the dispersion is raised to greater than seven, to stabilize/reinforce particles of the particulate dispersion. Optionally, the particles may be dried, and have increased porosity and surface area.

US Patent:

20080190037, Aug 14, 2008

Filed:

Apr 18, 2008

Appl. No.:

12/105732

Inventors:

David P. Workman - Naperville IL, US
Michael A. Romba - Joliet IL, US
Ronald S. Doles - LaGrange Park IL, US

International Classification:

B01J 2/28
B24D 3/02
C04B 14/04
B32B 9/00

US Classification:

51309, 23313 R, 106401, 106485, 502439, 428 3234

Abstract:

Metal oxide particle agglomerates prepared by adding an aluminum phosphate agglomerating agent with mixing to an aqueous dispersion of metal oxide nanoparticles to form an aqueous homogeneous dispersion of nanoparticles and agglomerating agent and then adjusting the pH of the dispersion with mixing to about 3.5 to about 6.5 to produce the particle agglomerates and use of the particle agglomerates to prepare ink receptive coatings, as catalysts, as reinforcing fillers, as polishing abrasives and as flattening agents.

US Patent:

20110233293, Sep 29, 2011

Filed:

Mar 26, 2010

Appl. No.:

12/661965

Inventors:

Richard F. Kral - North Riverside IL, US
Shane A. Mayhill - Crete IL, US
David P. Workman - Dublin OH, US

International Classification:

E01B 5/02
B23K 11/00

US Classification:

238122, 219 55

Abstract:

A rail repair method and insert therefor enables repair of rails and rail-like structures. A rail defect is initially identified and removed as contained within a volumetric material portion so as to form a contoured void while maintaining continuity of the rail opposite the void. A pre-formed insert is then placed into the void thereby effecting a rail-to-insert interface. Current is driven through the interface as force directs the insert against the rail. Resistance heat and pressure weld the insert to the rail. The flash welding aspects remove oxides and other impurities from the interface, and the forge welding aspects create a robust solid state weld. Excess material, whether flash, rail, or insert-based, is removed during the finishing processes to provide a virtually seamless rail repair. The solid state weld repair insert and underlying methodology enabled thereby may be used to repair any number of targeted metallic rail-like structures.

US Patent:

20130284706, Oct 31, 2013

Filed:

Jun 25, 2013

Appl. No.:

13/926639

Inventors:

Richard F. Kral - North Riverside IL, US
Shane A. Mayhill - Crete IL, US
David P. Workman - Dublin OH, US

International Classification:

B23K 11/00
E01B 29/42

US Classification:

219 55, 2940207

Abstract:

A rail repair method enables repair of rails and rail-like structures. A rail defect is initially identified and removed as contained within a volumetric material portion so as to form a contoured void while maintaining continuity of the rail opposite the void. A pre-formed insert is then placed into the void thereby effecting a rail-to-insert interface. Current is driven through the interface as force directs the insert against the rail. Resistance heat and pressure weld the insert to the rail. The flash welding aspects remove oxides and other impurities from the interface, and the forge welding aspects create a robust solid state weld. Excess material, whether flash, rail, or insert-based, is removed during the finishing processes to provide a virtually seamless rail repair. The solid state weld repair methodology may be used to repair any number of targeted metallic rail-like structures.