Patents by Inventor David John Williams
David John Williams has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20160136607Abstract: Disclosed herein are porous nanoparticles having a particle size of from about 50 nm to about 2 ?m and a pore diameter of from about 20 nm to about 400 nm. The porous nanoparticles include a resin composition comprising at least one polyester resin in the absence of an organic solvent, and a surfactant.Type: ApplicationFiled: January 20, 2016Publication date: May 19, 2016Inventors: David John William Lawton, Santiago Faucher
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Patent number: 9329508Abstract: The method of manufacturing toners disclosed herein includes a continuous temperature ramp and coalescence process that involves continuously passing toner slurry, such as an aggregated toner slurry, through at least one heat exchanger before being subjected to a cooling step. The heat exchanger is pressurized, so the temperature of the slurry may be increased above the atmospheric boiling point of water without boiling the water component of the slurry. Because of these higher temperatures, the coalescence step can be completed more quickly than in conventional batch processes. More than two heat exchangers may be connected in the coalescence step, yielding multiple ramping/cooling temperature steps, ability to inject components, or recycling heat from the process to reduce energy consumption.Type: GrantFiled: March 26, 2013Date of Patent: May 3, 2016Assignee: XEROX CORPORATIONInventors: David John William Lawton, David R. Kurceba, Frank Ping-Hay Lee, Daniel McDougall McNeil, Santiago Faucher
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Patent number: 9309114Abstract: The process for manufacturing porous nanoparticles disclosed herein includes feeding a dry-blended mixture of at least one resin and a neutralizing agent into a feed section of a screw extruder, injecting a surfactant solution downstream of the hopper, and adding an aqueous composition both directly after the surfactant solution as well as further downstream. Porous nanoparticles having a particle size of from about 50 nm to about 2 ?m and a pore diameter of from about 20 nm to about 400 nm may be continuously recovered from the extruder following this process.Type: GrantFiled: January 14, 2013Date of Patent: April 12, 2016Assignee: XEROX CORPORATIONInventors: David John William Lawton, Santiago Faucher
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Patent number: 9290637Abstract: A process for preparing a pigmented wax dispersion including (a) melting and mixing a dry pigment with at least one wax to form a pigment concentrate, wherein the pigment concentrate contains at least 25 percent by weight of pigment; (b) milling the pigment concentrate of step (a) to form a milled pigment concentrate; (c) combining the milled pigment concentrate of (b) with water and dispersing to form a pigmented wax dispersion comprising a plurality of pigmented wax particles comprising a pigment core surrounded by a wax shell, wherein the pigmented wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.Type: GrantFiled: April 19, 2014Date of Patent: March 22, 2016Assignee: Xerox CorporationInventors: Frank Ping-Hay Lee, Aurelian Valeriu Magdalinis, Michael J. D'Amato, Richard P. N. Veregin, David John William Lawton, Marcel P. Breton
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Patent number: 9210955Abstract: A bra comprising a front portion, the front portion comprising bra cups; two side portions, each side portion extending from a respective side of the front portion, wherein the side portions are adapted to encircle a torso of a wearer of the bra; wherein the front portion and the side portions are comprised of an outer layer and a frame layer beneath the outer layer; wherein the front portion is further comprised of an inner layer beneath the frame layer, wherein the bra cups are molded in the inner layer of the front portion; wherein the frame layer comprises: an outer frame layer primarily stretchable in a first direction; and an inner frame layer comprising at least one panel primarily stretchable in the first direction.Type: GrantFiled: October 16, 2012Date of Patent: December 15, 2015Assignee: LULULEMON ATHLETICA CANADA INC.Inventors: Yogendra V. Dandapure, Cassandra Ming Wai Sze, David John Williams
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Patent number: 9182691Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. An aggregated particle slurry is further heated in a first heat exchanger, and the heated slurry then flows through a residence time reactor. The slurry, now containing coalesced particles, then flows through a second heat exchanger and is quenched. The recovered coalesced particle slurry is then suitable for washing and drying. No moving parts are needed in this system.Type: GrantFiled: October 18, 2013Date of Patent: November 10, 2015Assignee: Xerox CorporationInventors: David John William Lawton, David R. Kurceba, Edward Graham Zwartz, Daniel McDougall McNeil
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Publication number: 20150301463Abstract: A toner including a resin; and a colorant wax comprising a plurality of colorant wax particles comprising a colorant core surrounded by a wax shell, wherein the colorant wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; and wherein the colorant wax is prepared by (a) melting and mixing a dry colorant with at least one wax to form a colorant concentrate, wherein the colorant concentrate contains at least 25 percent by weight of colorant; (b) milling the colorant concentrate of step (a) to form a milled colorant concentrate; (c) combining the milled colorant concentrate of (b) with water and dispersing to form the plurality of colorant wax particles; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.Type: ApplicationFiled: April 19, 2014Publication date: October 22, 2015Applicant: Xerox CorporationInventors: Frank Ping-Hay Lee, Richard P. N. Veregin, Shigang S. Qiu, Michael J. D'Amato, Aurelian Valeriu Magdalinis, David John William Lawton
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Publication number: 20150299425Abstract: A process for preparing a pigmented wax dispersion including (a) melting and mixing a dry pigment with at least one wax to form a pigment concentrate, wherein the pigment concentrate contains at least 25 percent by weight of pigment; (b) milling the pigment concentrate of step (a) to form a milled pigment concentrate; (c) combining the milled pigment concentrate of (b) with water and dispersing to form a pigmented wax dispersion comprising a plurality of pigmented wax particles comprising a pigment core surrounded by a wax shell, wherein the pigmented wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.Type: ApplicationFiled: April 19, 2014Publication date: October 22, 2015Applicant: Xerox CorporationInventors: Frank Ping-Hay Lee, Aurelian Valeriu Magdalinis, Michael J. D'Amato, Richard P. N. Veregin, David John William Lawton, Marcel P. Breton
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Publication number: 20150290651Abstract: Pigment dispersions are prepared by including magnetic particles in a reaction mixture. When placed in an alternating current magnetic field, milling of pigment particles occurs in the reaction mixture.Type: ApplicationFiled: April 9, 2014Publication date: October 15, 2015Applicant: Xerox CorporationInventors: Ke Zhou, David John William Lawton, Johan Junginger, Jun Zhao, Harry P. Latchman, Frank Ping-Hay Lee
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Publication number: 20150111151Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. An aggregated particle slurry is further heated in a first heat exchanger, and the heated slurry then flows through a residence time reactor. The slurry, now containing coalesced particles, then flows through a second heat exchanger and is quenched. The recovered coalesced particle slurry is then suitable for washing and drying. No moving parts are needed in this system.Type: ApplicationFiled: October 18, 2013Publication date: April 23, 2015Applicant: Xerox CorporationInventors: David John William Lawton, David R. Kurceba, Edward Graham Zwartz, Daniel McDougall McNeil
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Publication number: 20150104742Abstract: Toner compositions comprising toner particles are described, where the toner particles have an elastic modulus in the range of about 100 Pa to about 1050 Pa and/or have a viscous modulus in the range of about 100 Pa to about 1000 Pa.Type: ApplicationFiled: October 11, 2013Publication date: April 16, 2015Applicant: XEROX CORPORATIONInventors: Juan A. MORALES-TIRADO, David John William LAWTON, Vincenzo G. MARCELLO
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Publication number: 20140295346Abstract: The method of manufacturing toners disclosed herein includes a continuous temperature ramp and coalescence process that involves continuously passing toner slurry, such as an aggregated toner slurry, through at least one heat exchanger before being subjected to a cooling step. The heat exchanger is pressurized, so the temperature of the slurry may be increased above the atmospheric boiling point of water without boiling the water component of the slurry. Because of these higher temperatures, the coalescence step can be completed more quickly than in conventional batch processes. More than two heat exchangers may be connected in the coalescence step, yielding multiple ramping/cooling temperature steps, ability to inject components, or recycling heat from the process to reduce energy consumption.Type: ApplicationFiled: March 26, 2013Publication date: October 2, 2014Applicant: XEROX CORPORATIONInventors: David John William LAWTON, David R. KURCEBA, Frank Ping-Hay LEE, Daniel McDougall MCNEIL, Santiago FAUCHER
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Publication number: 20140199352Abstract: The process for manufacturing porous nanoparticles disclosed herein includes feeding a dry-blended mixture of at least one resin and a neutralizing agent into a feed section of a screw extruder, injecting a surfactant solution downstream of the hopper, and adding an aqueous composition both directly after the surfactant solution as well as further downstream. Porous nanoparticles having a particle size of from about 50 nm to about 2 ?m and a pore diameter of from about 20 nm to about 400 nm may be continuously recovered from the extruder following this process.Type: ApplicationFiled: January 14, 2013Publication date: July 17, 2014Applicant: XEROX CORPORATIONInventors: David John William LAWTON, Santiago FAUCHER
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Publication number: 20130284645Abstract: A separation conveyor (10) for separating a mass or slurry of different sized particles is provided. The separation conveyor includes a filter belt (12) including a feed side for receiving the mass or slurry and a filtrate side. The separation conveyor further includes a conveyor assembly (16) for conveying the filter belt, an overhead spray array (28) for spraying fluid downwards onto the slurry as it travels on the filter belt, and a lower spray array (30) for spraying fluid upwards against an underside of the belt. The upper and lower spray arrays are arranged in combination to assist in promoting separation of oversized particles on the feed side of the belt and undersized particles on the filtrate side of the belt.Type: ApplicationFiled: December 6, 2011Publication date: October 31, 2013Applicant: Australian Fine Coal Technology Pty Ltd.Inventors: David Francis Porteus, Paul Frederick Davis, David John Williams
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Patent number: 8113790Abstract: A pump assembly including a pumping element mounted for rotation within a pump chamber, movement of the pumping element in the chamber causing pumping of fluid within the pump chamber, and a motor, the motor including a stator and a rotor which is connected to the pumping element such that activation of the motor causes movement of the pumping element and hence pumping of fluid within the pump chamber, there being a sealing assembly which permits fluid in the pumping chamber to flow around the rotor but which substantially prevents fluid from the pumping chamber from contacting the stator, the sealing assembly including a partition part which lies between the stator and the pumping chamber and a sealing part which lies between the stator and the rotor, wherein the sealing part is made from a polymeric material over-molded onto the partition part.Type: GrantFiled: September 7, 2005Date of Patent: February 14, 2012Assignee: Pierburg Pump Technology UK LimitedInventors: David John Williams, David Black, Raymond Martin Johnson, Christopher Sadler, Tim P. Buttery
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Publication number: 20110152392Abstract: The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.Type: ApplicationFiled: December 14, 2010Publication date: June 23, 2011Applicant: HONEYWELL INTERNATIONAL INC.Inventors: MICHAEL VAN DER PUY, DAVID John WILLIAMS, CLIFFORD P. GITTERE
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Patent number: 7214294Abstract: This invention provides azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.Type: GrantFiled: September 16, 2004Date of Patent: May 8, 2007Assignee: Honeywell International Inc.Inventors: Leslie Bruce Bement, Mary Charlotte Bogdan, Clayton Herbert Carson, Peter Brian Logsdon, Hang Thanh Pham, Rajiv Ratna Singh, Hsueh Sung Tung, Ronald Riegal, David John Williams, Kevin Donald Uhrich
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Patent number: 7036480Abstract: A lubrication system for an engine includes a sump for lubricant, a pump to pump lubricant along a lubricant feed line to lubrication positions within the engine, and a lubricant conditioner, and wherein the pump is an electrically driven pump which is controlled by a system controller, there being a diverter valve which is under the control of the controller selectively to divert at least a proportion of the lubricant from the lubricant feed line to the lubricant conditioner.Type: GrantFiled: May 2, 2003Date of Patent: May 2, 2006Assignee: Dana Automotive LimitedInventors: David John Williams, David Thomas Black
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Publication number: 20060057005Abstract: A pump assembly including an electric motor, a pumping element mounted in a pump chamber, the motor being connected to the pumping element such that activation of the motor causes movement of the pumping element which in turn causes pumping of fluid in the pump chamber, and a motor controller which includes at least one electrical or electronic component and which controls operation of the motor, wherein at least one electrical or electronic component of the motor controller is mounted on or in a wall of the pump chamber.Type: ApplicationFiled: September 7, 2005Publication date: March 16, 2006Inventors: David John Williams, David Black, Raymond Martin Johnson, Christopher Sadler, Tim Buttery
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Patent number: 6986648Abstract: A pump including an electric motor mounted in a motor casing, and a rotatable pumping member, the pumping member when rotated by the motor pumping a first fluid, there being a first fluid flow path for the first fluid from a high pressure side of the pumping member, into the motor casing to cool the motor, and to a low pressure side of the pumping member, the pump further including a heat exchanger located between a wall of the motor casing and a heat load, the heat exchanger including a second fluid flow path for a second fluid so that in use, heat is exchanged between the first and second fluids.Type: GrantFiled: May 2, 2003Date of Patent: January 17, 2006Assignee: Dana Automotive LimitedInventors: David John Williams, David Thomas Black