Patents by Inventor Matthew C. Ezenyilimba
Matthew C. Ezenyilimba 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: 7696122Abstract: An electrocatalyst ink composition comprising a liquid vehicle, particles comprising at least one electrocatalyst metal, and at least one copolymer dispersant comprising at least one polyalkylene oxide segment.Type: GrantFiled: July 5, 2006Date of Patent: April 13, 2010Assignee: Cabot CorporationInventors: Matthew C. Ezenyilimba, Paolina Atanassova, Hanwei Lei, Ross A. Miesem, Ryan Cash Wall
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Publication number: 20080206616Abstract: The invention is directed to highly porous catalyst coated membranes and to sprayable inks and processes for forming catalyst coated membranes. In one aspect, the invention is to a sprayable ink, comprising catalyst particles, polymer electolyte ionomer, and a vehicle for dispersing the catalyst particles and polymer electolyte ionomer. In another aspect, the process comprises the steps of depositing an ink comprising catalyst particles and a vehicle onto a membrane and vaporizing from 40 to 95 weight percent of the vehicle from the sprayed ink under conditions effective to form a catalyst layer on the membrane. Preferably, the depositing and vaporizing steps are alternated to form multiple stacked catalyst layers on the membrane.Type: ApplicationFiled: February 27, 2007Publication date: August 28, 2008Applicant: Cabot CorporationInventors: Paolina Atanassova, James H. Brewster, Lawrence V. Lucero, Matthew C. Ezenyilimba
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Publication number: 20080009409Abstract: An electrocatalyst ink composition comprising a liquid vehicle, particles comprising at least one electrocatalyst metal, and at least one copolymer dispersant comprising at least one polyalkylene oxide segment.Type: ApplicationFiled: July 5, 2006Publication date: January 10, 2008Applicant: CABOT CORPORATIONInventors: MATTHEW C. EZENYILIMBA, PAOLINA ATANASSOVA, HANWEI LEI, ROSS A. MIESEM, RYAN CASH WALL
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Patent number: 7316881Abstract: A method of producing a custom color particulate toner for use in a two-component developer by mixing two or more component color toners. The component color toners are each surface treated with a blend of two or more types of silica particles, which differ in the functional groups appended to them. The silica blend for each component color toner is chosen so that, when the component color toners are mixed together to form the custom color mixture, they will all tribocharge to the same charge-to-mass ratio when mixed with a carrier to form a developer.Type: GrantFiled: October 25, 2004Date of Patent: January 8, 2008Assignee: Eastman Kodak CompanyInventors: Donald S. Rimai, William K. Goebel, Matthew C. Ezenyilimba, Peter S. Alexandrovich, Dinesh Tyagi, James H. Anderson
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Publication number: 20070298346Abstract: A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material and a quaternary ammonium tetraphenylborate salt in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.Type: ApplicationFiled: June 22, 2006Publication date: December 27, 2007Inventors: Matthew C. Ezenyilimba, John C. Wilson, Gretchen S. McGrath
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Publication number: 20030224280Abstract: A process for lowering the charge/mass (Q/m) ratio of toner particles formed by limited coalescence includes: forming an organic phase containing a water-immiscible liquid, pigment, a quaternary ammonium tetraphenylborate salt, and a polymeric material selected from the group consisting of an acrylic resin, a methacrylic resin, a styrene-acrylic resin, a styrene-methacrylic resin, a polyamide, and a polyester. The organic phase is dispersed in an aqueous phase containing a solid colloidal stabilizer, and a suspension of small droplets of the organic phase is formed in the aqueous phase by high shear agitation. The water-immiscible liquid is removed from the small droplets, thereby forming a suspension in the aqueous phase of small, non-spherically shaped solid particles, which are separated from the aqueous phase and dried. The quaternary ammonium tetraphenylborate salt is included in the organic phase in an amount effective for lowering the charge/mass (Q/m) ratio of the toner particles.Type: ApplicationFiled: April 15, 2003Publication date: December 4, 2003Inventors: Matthew C. Ezenyilimba, John C. Wilson, Gretchen S. McGrath
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Publication number: 20030087176Abstract: A process for preparing polymeric toner particles comprises dissolving a binder polymer in an organic solvent to form an organic phase, which is dispersed in an aqueous phase comprising a promoter and a particulate stabilizer to form a first dispersion. This first dispersion is homogenized to form a limited coalescence dispersion, to which is added poly(adipic acid-co-N-methylaminethanol), resulting in formation of a mixture comprising toner particle droplets. The organic solvent is removed from the mixture, and the resulting non-spherical toner particles are collected.Type: ApplicationFiled: July 2, 2002Publication date: May 8, 2003Inventors: Matthew C. Ezenyilimba, Hichang Yoon, John C. Wilson
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Patent number: 6528223Abstract: A composition for electrostatographic toner particles includes an organic binder polymer and a dye having the structure wherein Z represents a thiazole moiety IIType: GrantFiled: November 20, 2001Date of Patent: March 4, 2003Assignee: NexPress Solutions LLCInventors: John C Wilson, Matthew C Ezenyilimba, Dinesh Tyagi
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Publication number: 20030008227Abstract: A process for forming non-spherical toner particles by limited coalescence comprises: forming an organic phase comprising a polymeric material, a pigment, a quaternary ammonium tetraphenylborate salt, and a water-immiscible liquid; dispersing the organic phase in an aqueous phase containing a solid colloidal stabilizer; forming a suspension of small droplets of the organic phase in the aqueous phase by high shear agitation; removing the water-immiscible liquid from the small droplets, thereby forming a suspension of small solid particles in the aqueous phase; and separating and drying the solid particles, which are toner particles having a non-spherical shape.Type: ApplicationFiled: March 22, 2001Publication date: January 9, 2003Inventors: Matthew C. Ezenyilimba, John C. Wilson, Gretchen S. McGrath
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Patent number: 6482562Abstract: A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion wherein a flocculating agent is added to the aqueous phase before or after homogenization; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.Type: GrantFiled: August 31, 2001Date of Patent: November 19, 2002Assignee: Eastman Kodak CompanyInventors: Matthew C. Ezenyilimba, Michael T. Regan, Todd C. Zion, Dennis E. Smith, Hichang Yoon
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Patent number: 6416921Abstract: A process for forming non-spherical toner particles by limited coalescence comprises: forming an organic phase comprising a polymeric material, a pigment, a quaternary ammonium tetraphenylborate salt, a phosphonium salt polymer formed by condensation of at least one dicarboxylic acid or dicarboxylic ester monomer with at least one diol monomer, at least one of the acid or ester monomers including a triarylphosphonium salt group, and a water-immiscible liquid; dispersing the organic phase in an aqueous phase containing a solid colloidal stabilizer; forming a suspension of small droplets of the organic phase in the aqueous phase by high shear agitation; removing the water-immiscible liquid from the small droplets, thereby forming a suspension of small solid particles in the aqueous phase; and separating and drying the solid particles, which are toner particles having a non-spherical shape.Type: GrantFiled: March 22, 2001Date of Patent: July 9, 2002Assignee: Heidelberg Digital L.L.C.Inventors: John C. Wilson, Matthew C. Ezenyilimba, Gretchen S. McGrath
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Publication number: 20020068233Abstract: A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion wherein a flocculating agent is added to the aqueous phase before or after homogenization; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.Type: ApplicationFiled: August 31, 2001Publication date: June 6, 2002Inventors: Matthew C. Ezenyilimba, Michael T. Regan, Todd C. Zion, Dennis E. Smith, Hichang Yoon
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Patent number: 6380297Abstract: A method for the preparation of polymer particles comprising the steps of: a) forming an organic phase by dissolving a polymer material in a solvent; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer and homogenizing the resultant dispersion, thereby forming spherical particles having a selected particle and uniform particle size distribution; c) following the homogenizing, adding a particle shape-modifying surface active material to the spherical particles; and d) removing the solvent, thereby producing irregularly shaped polymer particles having substantially the same selected particle size and particle size distribution as that of the spherical particles.Type: GrantFiled: August 12, 1999Date of Patent: April 30, 2002Assignee: NexPress Solutions LLCInventors: Todd C. Zion, Dennis E. Smith, Hichang Yoon, Matthew C. Ezenyilimba
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Patent number: 6207338Abstract: A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a salt selected from aluminum salt and gallium salt and a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.Type: GrantFiled: March 10, 1999Date of Patent: March 27, 2001Assignee: Eastman Kodak CompanyInventors: Matthew C. Ezenyilimba, Michael T. Regan
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Patent number: 5968702Abstract: A method is described for the preparation of electrophotographic toner particles which includes the use of SOLSPERSE.RTM.. The method involves dissolving in ethyl acetate a hyperdispersant selected from SOLSPERSE.RTM. 24000 and SOLSPERSE.RTM. 20000, thereby forming a solution; mixing the solution with a polymer material to form an organic phase; dispersing the organic phase in an aqueous phase containing a particulate stabilizer and homogenizing the resultant dispersion; evaporating the solvent; and washing and drying the resultant product.Type: GrantFiled: November 24, 1997Date of Patent: October 19, 1999Assignee: Eastman Kodak CompanyInventors: Matthew C. Ezenyilimba, Mark A. Sweeney
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Patent number: 5968656Abstract: In accordance with the present invention, an intermediate toner transfer member includes a substrate and an outer surface layer that includes a ceramer comprising a polyurethane silicate hybrid organic-inorganic network. The ceramer is formed by a crosslinking reaction between a polyurethane with reactive alkoxysilane terminal moieties and a tetraalkoxysilane. The silane-terminated polyurethane is the reaction product of one or more aliphatic polyols with terminal hydroxyl groups and an alkoxysilane-substituted alkyl isocyanate compound. Further in accordance with the present invention is a process for forming an intermediate toner transfer member having an outer surface layer comprising a polyurethane silicate hybrid organic-inorganic network.Type: GrantFiled: April 25, 1997Date of Patent: October 19, 1999Assignee: Eastman Kodak CompanyInventors: Matthew C. Ezenyilimba, John C. Wilson, William B. Vreeland
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Patent number: 5272002Abstract: An optical article is disclosed comprised of an organic layer unit exhibiting a second order polarization susceptibility greater than 10.sup.-9 esu and means for providing an optical input to and an optical output from the layer unit. The organic layer unit exhibits a transmission attenuation of less than 2 dB/cm and is comprised of a Y type Langmuir-Blodgett assembly having superimposed oriented monomolecular layers of first and second polymeric amphiphiles each containing repeating units comprised of a hydrophilic moiety and a lipophilic moiety. Repeating units of one or both of the first and second amphiphiles each contain an organic molecular dipole, and repeating units of one or both of the first and second amphiphiles each contains a branched lipophilic moiety of up to 9 carbon atoms.Type: GrantFiled: July 14, 1992Date of Patent: December 21, 1993Assignee: Eastman Kodak CompanyInventors: Thomas L. Penner, Douglas R. Robello, Nancy J. Armstrong, David J. Williams, Matthew C. Ezenyilimba
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Patent number: 5247602Abstract: An optical article is disclosed comprised of a support including a portion adjacent one major surface which is transparent to the electromagnetic radiation sought to be propagated, an organic layer unit capable of converting a portion of polarized electromagnetic radiation of a selected wavelength to its second harmonic wavelength, means for optically coupling into said organic layer unit polarized electromagnetic radiation of a selected wavelength in its zero order transverse magnetic mode, and means for receiving from the layer unit a portion of the electromagnetic radiation in the form of a first order transverse magnetic mode. The organic layer unit has a thickness which is at least 70 percent cf the wavelength of the zero order transverse magnetic mode and differs by less than 100 .ANG. from the thickness required for identical propagation constants of the zero and first order transverse magnetic modes.Type: GrantFiled: July 14, 1992Date of Patent: September 21, 1993Assignee: Eastman Kodak CompanyInventors: Thomas L. Penner, Douglas R. Robello, Nancy J. Armstrong, David J. Williams, Matthew C. Ezenyilimba