James Hohman
Electrician in Newark, DE
License number
Delaware TH-0004469
Issued Date
Sep 8, 2008
Expiration Date
Sep 8, 2009
Category
Electrical Examiners
Type
Homeowner's Permit
Address
Address
2
Newark, DE 19711
Professional information
Device For Producing Stabilized Organic Pigment Particles
US Patent:
2004014, Aug 5, 2004
Filed:
Jan 22, 2004
Appl. No.:
10/762722
Inventors:
Sandra Witman - Wilmington DE, US
James Hohman - Newark DE, US
James Hohman - Newark DE, US
International Classification:
C09B067/00
US Classification:
106/493000, 422/225000, 106/412000, 366/101000
Abstract:
A method of producing self dispersible organic pigment particles stabilized by the method. The method includes modifying organic pigment particles and then contacting the surface modified particles with an aqueous vapor entrained in a carrier gas to produce the stabilized organic pigment particles. Typically the pigment particles are modified by exposing their surfaces to ozone or a plasma-activated process gas. The surface stabilizing method prevents the violent exothermic reaction, which occurs when surface modified pigment particles are exposed to ambient air. The method is accomplished in a device, which includes a reactor, means for introducing in the reactor aqueous vapor entrained in a carrier gas and an agitator assembly for deagglomerating during surface modification the pigment particles placed in the reactor. The stabilized particles of the present invention are also well suited for use in ink jet inks, pigmented waterborne and solvent borne coating compositions, and pigmented powder coating compositions.
Method Of Producing Stabilized Organic Pigment Particles And Device Therefor
US Patent:
2003007, Apr 24, 2003
Filed:
Aug 23, 2002
Appl. No.:
10/226898
Inventors:
Sandra Witman - Wilmington DE, US
James Hohman - Newark DE, US
James Hohman - Newark DE, US
International Classification:
B05D007/00
US Classification:
428/373000, 428/401000, 427/240000, 427/242000, 427/212000
Abstract:
A method of producing self dispersible organic pigment particles stabilized by the method. The method includes modifying organic pigment particles and then contacting the surface modified particles with an aqueous vapor entrained in a carrier gas to produce the stabilized organic pigment particles. Typically the pigment particles are modified by exposing their surfaces to ozone or a plasma-activated process gas. The surface stabilizing method prevents the violent exothermic reaction, which occurs when surface modified pigment particles are exposed to ambient air. The method is accomplished in a device, which includes a reactor, means for introducing in the reactor aqueous vapor entrained in a carrier gas and an agitator assembly for deagglomerating during surface modification the pigment particles placed in the reactor. The stabilized particles of the present invention are also well suited for use in ink jet inks, pigmented waterborne and solvent borne coating compositions, and pigmented powder coating compositions.
Self-Dispersing Pigment And Process Of Making And Use Of Same
US Patent:
6852156, Feb 8, 2005
Filed:
May 23, 2001
Appl. No.:
09/863167
Inventors:
Michael J. Eiseman - Swarthmore PA, US
Robert Paul Held - Newark DE, US
James L. Hohman - Newark DE, US
Dhiren V. Patel - Hockessin DE, US
Harry Joseph Spinelli - Wilmington DE, US
Sandra L. Witman - Wilmington DE, US
Robert Paul Held - Newark DE, US
James L. Hohman - Newark DE, US
Dhiren V. Patel - Hockessin DE, US
Harry Joseph Spinelli - Wilmington DE, US
Sandra L. Witman - Wilmington DE, US
Assignee:
E.I. du Pont de Nemours and Company - Wilmington DE
International Classification:
C09D011/00, C09C001/44
US Classification:
106 316, 106 3165, 106 319, 106478
Abstract:
A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 μmoles/M. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.
Treatment Of Deagglomerated Particles With Plasma-Activated Species
US Patent:
6156114, Dec 5, 2000
Filed:
Aug 4, 1998
Appl. No.:
9/125059
Inventors:
Timothy Allan Bell - Wilmington DE
Wronald Scott Best - Wilmington DE
Michael Patrick Chouinard - Wilmington DE
Paul Francis Herman - Newark DE
James Lewis Hohman - Newark DE
Laurence J. Levase - Thornton PA
Thomas William Harding - Wilmington DE
Wronald Scott Best - Wilmington DE
Michael Patrick Chouinard - Wilmington DE
Paul Francis Herman - Newark DE
James Lewis Hohman - Newark DE
Laurence J. Levase - Thornton PA
Thomas William Harding - Wilmington DE
Assignee:
E. I. du Pont de Nemours and Company - Wilmington DE
International Classification:
C23C 1602, C23C 1650, C09D 1700, C09D 500, B05D 306
US Classification:
106400
Abstract:
A method for treating the surface of substantially each deagglomerated particle of an array of easily agglomerated particles by contacting deagglomerated particles with a plasma-activated gas species and modifying the surfaces of the deagglomerated particles to aid subsequent incorporation of the particles into a matrix composition; the module for deagglomerating and dispersing the particles into the plasma-activated gas; the apparatus that comprises the deagglomeration module (322) and a reaction chamber (20) in which the particles are treated with the plasma-activated gas; the method for deagglomerating particles that may reagglomerate after plasma treatment; and a color composition containing plasma-treated pigment particles.
Liquid/Vapor Optical Modulator
US Patent:
5193024, Mar 9, 1993
Filed:
Oct 31, 1990
Appl. No.:
7/606364
Inventors:
John A. Lawton - Landenberg PA
Evan D. Laganis - Wilmington DE
James L. Hohman - Newark DE
Evan D. Laganis - Wilmington DE
James L. Hohman - Newark DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G02F 103, G02F 2600
US Classification:
359253
Abstract:
Apparatus and methods for modulating light involving the formation of bubbles in a normally opaque dye solution contained within a cell. The bubbles are created in the dye solution by focusing a beam from a laser in regions of the dye solution thereby vaporizing a solvent in the solution. When the bubble is formed, the modulator becomes substantially transparent in the region of the bubble. If the focused laser beam is turned off, the bubble condenses and the modulator again becomes opaque in the region of the condensed bubble.
Waveguide Structure Using Potassium Titanyl Phosphate
US Patent:
5042895, Aug 27, 1991
Filed:
Sep 4, 1990
Appl. No.:
7/543783
Inventors:
Michael P. Chouinard - Wilmington DE
Edward P. Gargiulo - Wilmington DE
James L. Hohman - Newark DE
Daniel B. Laubacher - Wilmington DE
Moshe Oren - Wilmington DE
O. Robert Averitt - Newark DE
Patrick H. Wyant - Cochranville PA
Edward P. Gargiulo - Wilmington DE
James L. Hohman - Newark DE
Daniel B. Laubacher - Wilmington DE
Moshe Oren - Wilmington DE
O. Robert Averitt - Newark DE
Patrick H. Wyant - Cochranville PA
Assignee:
E. I. du Pont de Nemours and Company - Wilmington DE
International Classification:
G02B 610
US Classification:
385 2
Abstract:
An electro-optic waveguide structure having a single mode channeled waveguide pattern of the Mach-Zehnder configuration is formed in a substrate of potassium titanyl phosphate.