Patents by Inventor Allan K. Chen
Allan K. Chen 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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Patent number: 9822217Abstract: A branched polyester suitable for use in solvent-free emulsification, the branched polyester having a first original weight average molecular weight before undergoing solvent-free emulsification and a second weight average molecular weight after undergoing solvent-free emulsification, wherein the branched polyester has a structure that limits degradation of the polyester during solvent-free emulsification to less than about 20 percent of the first original weight average molecular weight, wherein the branched polyester comprises a compound of the formula described.Type: GrantFiled: March 19, 2012Date of Patent: November 21, 2017Assignee: Xerox CorporationInventors: Santiago Faucher, Guerino G. Sacripante, Shigang S. Qiu, Allan K. Chen, Jordan H. Wosnick
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Patent number: 9239529Abstract: Processes for producing toners are provided. The processes include determining the desired gloss for a given toner, and determining the desired amount of aluminum in the toner to obtain that gloss. Utilizing the processes of the present disclosure, the solids content of an emulsion utilized to produce such a toner, as well as the mixing speed utilized in the aggregation process and the temperature at which aggregation of the toner particles occurs, may then be selected to obtain toner particles possessing the desired amount of aluminum, and thus the desired gloss.Type: GrantFiled: December 20, 2010Date of Patent: January 19, 2016Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Daryl W. Vanbesien, Allan K. Chen, Sonja Hadzidedic
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Patent number: 9012118Abstract: Toners are provided which possess excellent blocking characteristics. The toners include cores including amorphous resins having low glass transition temperatures, amorphous resins having high glass transition temperatures, and crystalline resins, and shells including amorphous resins having high glass transition temperatures.Type: GrantFiled: March 4, 2010Date of Patent: April 21, 2015Assignee: Xerox CorporationInventors: Allan K. Chen, Tie Hwee Ng, Edward Graham Zwartz, Michael S. Hawkins
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Patent number: 8618192Abstract: A process for making a latex emulsion suitable for use in a toner composition includes contacting at least one amorphous polyester resin with a viscosity reducing additive in the absence of an organic solvent to form a resin mixture either via an extruder or batch process, and adding a surfactant, neutralizing agent, and deionized water to the resin mixture.Type: GrantFiled: February 5, 2010Date of Patent: December 31, 2013Assignee: Xerox CorporationInventors: Santiago Faucher, Joo T. Chung, Timothy L. Lincoln, Shigang Qiu, Yuhua Tong, Fumii Higuchi, Emine Irmak Serifoglu, Allan K. Chen, Brian J. Andaya, Joseph L. Leonardo
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Patent number: 8574804Abstract: Toners are provided, which possess low melt properties capable of producing a low gloss finish. The toners include a core and a shell. The shell includes a crystalline resin. The core may include at least one amorphous resin, an optional crystalline resin, an optional wax, and an optional colorant.Type: GrantFiled: August 26, 2010Date of Patent: November 5, 2013Assignee: Xerox CorporationInventors: Allan K. Chen, Santiago Faucher, Edward Graham Zwartz, Kimberly D. Nosella, Daryl W. Vanbesien
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Publication number: 20130245197Abstract: A branched polyester suitable for use in solvent-free emulsification, the branched polyester having a first original weight average molecular weight before undergoing solvent-free emulsification and a second weight average molecular weight after undergoing solvent-free emulsification, wherein the branched polyester has a structure that limits degradation of the polyester during solvent-free emulsification to less than about 20 percent of the first original weight average molecular weight, wherein the branched polyester comprises a compound of the formula described.Type: ApplicationFiled: March 19, 2012Publication date: September 19, 2013Inventors: Santiago Faucher, Guerino G. Sacripante, Shigang S. Qiu, Allan K. Chen, Jordan H. Wosnick
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Publication number: 20130244151Abstract: A toner comprising a branched polyester suitable for use in solvent-free emulsification, the branched polyester having a first original weight average molecular weight before undergoing solvent-free emulsification and a second weight average molecular weight after undergoing solvent-free emulsification, wherein the branched polyester has a structure that limits degradation of the polyester during solvent-free emulsification to less than about 20 percent of the first original weight average molecular weight, wherein the branched polyester comprises a compound of the formula described; an optional wax, and an optional colorant.Type: ApplicationFiled: March 19, 2012Publication date: September 19, 2013Inventors: Allan K. Chen, Santiago Faucher, Guerino G. Sacripante, Shigang S. Qiu
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Patent number: 8518627Abstract: The present disclosure provides processes for producing toners. In embodiments, silica is added as a chelating agent during the toner production process contributing to enhanced triboelectric charging properties of the toner particles.Type: GrantFiled: January 24, 2011Date of Patent: August 27, 2013Assignee: Xerox CorporationInventors: Allan K. Chen, Santiago Faucher, Shigang S. Qiu, Karen A. Moffat, Richard P. N. Veregin
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Patent number: 8486602Abstract: A method of making toner particles, including cold homogenizing at a temperature below room temperature a resin emulsion, a colorant, an optional wax, and optional additives with a coagulant to form a toner slurry; heating the toner slurry to form aggregated toner particles; freezing aggregation of the particles in the slurry once at a desired aggregated particle size; and further heating the aggregated particles in the slurry to coalesce the aggregated particles into toner particles.Type: GrantFiled: October 22, 2009Date of Patent: July 16, 2013Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Tie Hwee Ng, Allan K. Chen, Abdisamed Sheik-Qasim, Melanie L. Davis
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Patent number: 8450040Abstract: A method of making toner particles, including mixing at least one emulsion of at least one resin, a colorant, an optional wax, and optional additives to form a slurry; heating the slurry to form aggregated particles in the slurry; freezing aggregation of the particles with a buffer solution; and heating the aggregated particles in the slurry to coalesce the particles into toner particles.Type: GrantFiled: October 22, 2009Date of Patent: May 28, 2013Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Allan K. Chen, Abdisamed Sheik-Qasim, Melanie L. Davis, Zhen Lai
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Patent number: 8431318Abstract: The present disclosure provides processes for producing polyester toners by emulsion aggregation where the resulting toner particles have high pigment loadings and desired circularity. The methods include adding a metal, in embodiments a metal compound, at the beginning of coalescence, which speeds the coalescence process and produces toner particles having a desired size and circularity for use in electrophotographic imaging systems.Type: GrantFiled: April 9, 2010Date of Patent: April 30, 2013Assignee: Xerox CorporationInventors: Daryl W. Vanbesien, Allan K. Chen, Kimberly D. Nosella, Cuong Vong, Karen Ann Moffat, Richard P. N. Veregin, Valerie M. Farrugia
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Patent number: 8323865Abstract: Toners are provided which may be suitable for use in cold fusing pressure apparatus. The toners include low molecular weight amorphous resins having low softening points and low molecular weights, compared with resins utilized in conventional emulsion aggregation toners for low melt fusing applications.Type: GrantFiled: August 4, 2009Date of Patent: December 4, 2012Assignee: Xerox CorporationInventors: Allan K. Chen, Guerino G. Sacripante
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Patent number: 8322555Abstract: A lid includes a generally flat interior portion and an outer ridge area surrounding the interior portion. The outer ridge area includes a first ridge side, a ridge top, and a second ridge side. The first ridge side extends generally upward from the interior portion. The ridge top extends from the first ridge side and is generally parallel to the interior portion. The second ridge side extends generally downward from the ridge top. The second ridge side includes a top section and a bottom section. A thickness of the bottom section is smaller than a thickness of the top section. The bottom section includes at least one fixed tab and at least one tear band. The at least one fixed tab is separated from the at least one tear band by at least one vertical membrane.Type: GrantFiled: October 14, 2008Date of Patent: December 4, 2012Assignee: PWP Industries, Inc.Inventor: Allan K. Chen
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Patent number: 8313884Abstract: A process for making toner particles is provided. In embodiments, a suitable process includes adding a defoamer to an emulsion utilized to form toner particles. Utilization of the defoamer allows for a reduction in the overall aggregation/coalescence cycle time and slurry viscosity, while producing a toner with improved GSDs, low coarse and target circularities.Type: GrantFiled: July 14, 2010Date of Patent: November 20, 2012Assignee: Xerox CorporationInventors: Kimberly D. Nosella, Allan K. Chen, Zhen Lai, Zhaoyang Ou, Daryl W. Vanbesien
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Publication number: 20120189956Abstract: The present disclosure provides processes for producing toners. In embodiments, alkyl or alkyl ether sulfates are used in a solvent-free toner production process as surfactants to provide for higher parent particle charge without adversely affecting particle size, distribution control and circularity of the toner particles. The present disclosure also provides a new formulation and process for the emulsification of polyester resins to form nano-scale particles dispersed in water (latex) without the use of organic solvents by an extrusion process.Type: ApplicationFiled: January 26, 2011Publication date: July 26, 2012Applicant: XEROX CORPORATIONInventors: Allan K. Chen, Santiago Faucher, John L. Pawlak, Joo T. Chung, Shigang S. Qiu, Michael S. Hawkins, Edward G. Zwartz, Abdisamed Sheik-Qasim, Melanie Lynn Davis
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Publication number: 20120189955Abstract: The present disclosure provides processes for producing toners. In embodiments, silica is added as a chelating agent during the toner production process contributing to enhanced triboelectric charging properties of the toner particles.Type: ApplicationFiled: January 24, 2011Publication date: July 26, 2012Applicant: XEROX CORPORATIONInventors: Allan K. Chen, Santiago Faucher, Shigang S. Qiu, Karen A. Moffat, Richard P.N. Veregin
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Patent number: 8211604Abstract: A process for making a self-emulsifying composite suitable for use in forming latex emulsions includes contacting a resin with a solid or highly concentrated surfactant, a solid neutralizing agent in the absence of water and an organic solvent to form a mixture, melt mixing the mixture, and forming a self-emulsifying composite of the melt mixed mixture such as a granule. Self-emulsifying granules are also provided and configured to form a latex emulsion when added to water, which may then be utilized to form a toner.Type: GrantFiled: June 16, 2009Date of Patent: July 3, 2012Assignee: Xerox CorporationInventors: Santiago Faucher, Rina Carlini, Joo T. Chung, Fumii Higuchi, Shigang Qiu, Allan K. Chen, Edward Graham Zwartz, Michael Steven Hawkins, Brian J. Andaya, Joseph L. Leonardo
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Publication number: 20120156610Abstract: Processes for producing toners are provided. The processes include determining the desired gloss for a given toner, and determining the desired amount of aluminum in the toner to obtain that gloss. Utilizing the processes of the present disclosure, the solids content of an emulsion utilized to produce such a toner, as well as the mixing speed utilized in the aggregation process and the temperature at which aggregation of the toner particles occurs, may then be selected to obtain toner particles possessing the desired amount of aluminum, and thus the desired gloss.Type: ApplicationFiled: December 20, 2010Publication date: June 21, 2012Applicant: XEROX CORPORATIONInventors: Kimberly D. Nosella, Daryl W. Vanbesien, Allan K. Chen, Sonja Hadzidedic
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Publication number: 20120052433Abstract: Toners are provided, which possess low melt properties capable of producing a low gloss finish. The toners include a core and a shell. The shell includes a crystalline resin. The core may include at least one amorphous resin, an optional crystalline resin, an optional wax, and an optional colorant.Type: ApplicationFiled: August 26, 2010Publication date: March 1, 2012Applicant: XEROX CORPORATIONInventors: Allan K. Chen, Santiago Faucher, Edward Graham Zwartz, Kimberly D. Nosella, Daryl W. Vanbesien
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Publication number: 20110250535Abstract: The present disclosure provides processes for producing polyester toners by emulsion aggregation where the resulting toner particles have high pigment loadings and desired circularity. The methods include adding a metal, in embodiments a metal compound, at the beginning of coalescence, which speeds the coalescence process and produces toner particles having a desired size and circularity for use in electrophotographic imaging systems.Type: ApplicationFiled: April 9, 2010Publication date: October 13, 2011Applicant: XEROX CORPORATIONInventors: Daryl W. Vanbesien, Allan K. Chen, Kimberly D. Nosella, Cuong Vong, Karen Ann Moffat, Richard P.N. Veregin, Valerie M. Farrugia