David C Workman

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:

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:

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.

US Patent:

63126443, Nov 6, 2001

Filed:

Dec 16, 1999

Appl. No.:

9/465146

Inventors:

Barbara E. Moriarty - Palatine IL
Mingli Wei - Naperville IL
John E. Hoots - St. Charles IL
David P. Workman - Naperville IL
Jeffrey P. Rasimas - Naperville IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C23F 1110
C02F 510
C09K 1106

US Classification:

422 14

Abstract:

Fluorescent monomers of the formula ##STR1## wherein M is selected from the group consisting of hydrogen, sodium, potassium, cesium, rubidium, lithium and ammonium, and n is selected from the group consisting of 1, 2, 3, 4, 6 and 9; are provided which are useful in the production of pyranine-tagged polymers which can be detected using a fluorometer and can be used in industrial water systems as treatment polymers.