Patents by Inventor Dinesh Tyagi

Dinesh Tyagi 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).

  • TONER COMPOSITION FOR PREVENTING IMAGE BLOCKING
    Publication number: 20090297970
    Abstract: Images produced by electrophotography are often subjected to harsh conditions, such as high temperature and high relative humidity conditions. Prints when subjected to face-to-face stacking under these conditions tend to stick and are difficult to separate without damage. Ethylene-bis-stearamide is incorporated in a protective toner formulation employing a toner binder having a higher glass transition temperature than that of the conventional CYMK colored image toners employed to provide a protective layer in fused images. Further, ethylene-bis-stearamide does not interfere with typical oil release additives used in fuser rollers. By combining ethylene-bis-stearamide with polyalkane waxes having a weight average molecular weight of equal to or greater than 2000 and a poly dispersity of less than 2.0, addition protection can be realized.
    Type: Application
    Filed: May 4, 2009
    Publication date: December 3, 2009
    Inventors: Dinesh Tyagi, Walter B. Sherwood, Louise Granica
  • DEVELOPER FOR SELECTIVE PRINTING OF RAISED INFORMATION BY ELECTROGRAPHY
    Publication number: 20090291274
    Abstract: The use of electrographic printing to prepare prints which have a desired tactile feel or raised information in a controlled manner by utilizing a developer having toner particle size larger than 50 microns volume average diameter and carrier particles larger than the toner particle size such that the volume average distribution overlap between the toner distribution curve and carrier particle distribution curve is less than 35% and the carrier and toner particles have a volume average diameter size differential equal to or greater than 5 microns or the ratio of carrier-to-toner volume average diameter exceeds 1.25.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Inventors: Dinesh Tyagi, Patrick M. Lambert, Mark C. Zaretsky, Thomas N. Tombs
  • Adjustable gloss document printing
    Publication number: 20090286177
    Abstract: A method and system for printing adjustable gloss image documents using a variety of toners where some toners have a relatively low melt viscosity and others have a relatively high melt viscosity. These toners are co-printed prior to fixing, on the receiver proximate to and overlying at least a portion of each other.
    Type: Application
    Filed: May 15, 2008
    Publication date: November 19, 2009
    Inventors: Dinesh Tyagi, Yee S. Ng, Mark C. Zaretsky
  • Separating agent for use in a fuser mechanism
    Patent number: 7596347
    Abstract: A separating agent, in particular silicon oil, applied to the surface of a fuser mechanism, preferably in an electrophotographic printing machine. Contamination of the surfaces of the printing media is substantially prevented or reduced when the separating agent is diluted with at least one solvent with a boiling point equal to or greater than 60° C., preferably equal to or greater than 100° C., but below 160° C.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: September 29, 2009
    Assignee: Eastman Kodak Company
    Inventors: Udo Dräger, Detlef Schulze-Hagenest, Cumar Sreekumar, Dinesh Tyagi
  • CHILLED FINISH ROLLER SYSTEM AND METHOD
    Publication number: 20090239172
    Abstract: An apparatus for fixing of toner onto a receiver, including: a non-contact fuser capable of fusing one or more layers of toner on a receiver such that one or more toner layers reach a fusing temperature above a glass transition temperature. The apparatus also includes one or more cooling finish rollers located downstream from the non-contact fuser to lower the toner temperature.
    Type: Application
    Filed: June 2, 2009
    Publication date: September 24, 2009
    Inventors: Andrew Ciaschi, Dinesh Tyagi, James H. Hurst, Arun Chowdry, Eric C. Stelter, Robert D. Bobo, Muhammed Aslam
  • Reactive polymer particles and method of preparation
    Patent number: 7550244
    Abstract: The present invention provides a method for the preparation of a UV curable electrostatographic toner. The process includes the steps of dispersing a polymeric material and a UV curable material and a UV photoinitiator in an organic solvent to form an organic phase. The organic phase is dispersed in an aqueous phase containing a particulate stabilizer to form a dispersion. The dispersion is homogenized and the organic solvent is removed from the dispersed particles in the dispersion which are then recovered.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: June 23, 2009
    Assignee: Eastman Kodak Company
    Inventors: Xin Jin, Lloyd A. Lobo, Dinesh Tyagi
  • TONER COMPOSITION
    Publication number: 20090155704
    Abstract: The present invention is a toner that includes a polymeric binder and a polyethylene wax or ester wax. A dispersing agent of poly(ethylene vinyl acetate) is included in the toner that dispersed the wax and reduces the amount of free wax particles.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Inventors: Robert D. Fields, Charles T. Havens, Peter S. Alexandrovich, Dinesh Tyagi
  • Sulfone charge control agents for electrostatographic toners
    Patent number: 7541130
    Abstract: The present invention is directed to an electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group. The present invention is also directed to an electorstatographic developer containing the electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group and carrier particles.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: June 2, 2009
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Guistina, Dinesh Tyagi, Jason Morgan
  • NEGATIVE CHARGE CONTROL AGENTS AND THEIR PREPARATION
    Publication number: 20090117484
    Abstract: The present invention provides an electrostatographic toner that has a condensation polymer binder having carboxylic acid end groups and an acid number of 4 or greater. The carboxylic end groups are converted to metal salts having the structure; (—COO?1)nM+n where M is selected from groups IB, IIB, IIIB, IVB, VB, or IA, IIA, IIIA, IVA, VA, VIA, VIIA and VIIIA of the periodic table and n is an integer from 1-4. The present invention also provides a developer of carrier particles and the electrostatographic toner.
    Type: Application
    Filed: November 5, 2007
    Publication date: May 7, 2009
    Inventors: Robert A. Guistina, Dinesh Tyagi, Jason Morgan
  • Electrostatographic toner containing organometallic dimethyl sulfoxide complex charge control agent
    Patent number: 7501218
    Abstract: The present invention is an electrostatographic toner that includes an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12, The present invention also includes a developer having a toner, an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12, and a carrier particle.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: March 10, 2009
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Guistina, Jason Morgan, Dinesh Tyagi
  • SILICONE WAX-CONTAINING TONER PARTICLES WITH CONTROLLED MORPHOLOGY
    Publication number: 20090017396
    Abstract: The present invention is a method for the preparation of electrostatographic toner including the following steps. A first dispersion is prepared with a solvent, a silicone wax, and a hyperdispersant. The first dispersion is added to an organic solvent containing a polymer material to form an organic phase. The organic phase is dispersed in an aqueous phase containing a particulate stabilizer to form a second dispersion. The second dispersion is homogenized. The organic solvent is evaporated from the second dispersion and the resultant product is recovered, washed and dried. In an alternate method the hyperdispersant is added directly to the organic phase before mixing with the aqueous phase.
    Type: Application
    Filed: July 13, 2007
    Publication date: January 15, 2009
    Inventors: Xiqiang Yang, Dinesh Tyagi
  • Selective printing of raised information by electrography
    Publication number: 20080159786
    Abstract: Electrographic printing wherein raised information, with a distinct tactile feel, can be printed by electrographic techniques. Such electrographic printing comprises the steps of forming a desired print image, electrographically, on a receiver member utilizing standard size marking particles; and in an area of the formed print image, where desired tactile feel, raised information is to be formed, selectively forming such tactile feel, raised information utilizing marking particles of a substantially larger size than the standard size marking particles of the desired print image.
    Type: Application
    Filed: December 27, 2006
    Publication date: July 3, 2008
    Inventors: Thomas Nathaniel Tombs, Arun Chowdry, Hwai-Tzuu Tai, Dinesh Tyagi, Muhammed Aslam, Earl Gregory Gomes
  • TONER PARTICLES OF CONTROLLED MORPHOLOGY
    Publication number: 20080145780
    Abstract: The present invention is a method for the preparation of electrostatographic toner including the following steps. A polymer material is dissolved in an organic solvent to form an organic phase. The organic phase is dispersed in an aqueous phase that includes a particulate stabilizer and a salt including an anion selected from chloride, oxychloride, sulfate, perchlorate, nitrate, dihydrogen phosphate, lactate, trifluoromethylsulfonate, and trifluromethylhydrate and a cation selected from aluminum, iron (III), tin (II) and zirconium (IV), to form a dispersion. The dispersion is homogenized. The organic solvent is evaporated from the dispersion and the resultant product is recovered, washed and dried. In an alternate method the salt is added directly to the dispersion.
    Type: Application
    Filed: December 15, 2006
    Publication date: June 19, 2008
    Inventors: Xiqiang Yang, Dinesh Tyagi, Lloyd A. Lobo, Patrick M. Lambert, Sandra G. Taft
  • SEPARATING AGENT FOR USE IN A FUSER MECHANISM
    Publication number: 20080112735
    Abstract: A separating agent, in particular silicon oil, applied to the surface of a fuser mechanism, preferably in an electrophotographic printing machine. Contamination of the surfaces of the printing media is substantially prevented or reduced when the separating agent is diluted with at least one solvent with a boiling point equal to or greater than 60° C., preferably equal to or greater than 100° C., but below 160° C.
    Type: Application
    Filed: January 15, 2008
    Publication date: May 15, 2008
    Inventors: Udo Drager, Detlef Schulze-Hagenest, Cumar Sreekumar, Dinesh Tyagi
  • Preparation of a toner for reproducing a metallic hue and the toner
    Patent number: 7326507
    Abstract: The present invention relates to a toner and process for preparing a toner for reproduction of a metallic, preferably golden or silvery, hue by a printing process, especially for electrophotography. A congeneric process and/or a congeneric toner is preserved with regard to its metallic hue and at the same time not to impair the essential properties of the toner for the printing process in which it is to be used. At least one metallic pigment is provided with a coating of silicate and subsequently with an organic layer and combining the thus obtained particle with toner material.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: February 5, 2008
    Assignee: Eastman Kodak Company
    Inventors: Detlef Schulze-Hagenest, Udo Dräger, Dinesh Tyagi
  • Method of producing a custom color toner
    Patent number: 7316881
    Abstract: 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: Grant
    Filed: October 25, 2004
    Date of Patent: January 8, 2008
    Assignee: Eastman Kodak Company
    Inventors: Donald S. Rimai, William K. Goebel, Matthew C. Ezenyilimba, Peter S. Alexandrovich, Dinesh Tyagi, James H. Anderson
  • Electrophotographic toner and development process with improved charge to mass stability
    Patent number: 7314696
    Abstract: Toners and developers are disclosed. The toner of the present invention contains at least one toner resin, at least one charge control agent, at least one surface treatment agent, and optionally at least one release agent and/or colorant. The toners of the present invention have excellent triboelectric stability over a wide range of temperatures and relative humidity environmental conditions. Further, the toners of the present invention have excellent charge to mass stability over long periods of time. Development systems and methods for developing electrostatic images with toner are further disclosed.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: January 1, 2008
    Assignee: Eastman Kodak Company
    Inventors: Robert D. Fields, Patrick M. Lambert, Dinesh Tyagi, James H. Anderson
  • Reactive polymer particles and method of preparation
    Publication number: 20070292800
    Abstract: The present invention provides a method for the preparation of a UV curable electrostatographic toner. The process includes the steps of dispersing a polymeric material and a UV curable material and a UV photoinitiator in an organic solvent to form an organic phase. The organic phase is dispersed in an aqueous phase containing a particulate stabilizer to form a dispersion. The dispersion is homogenized and the organic solvent is removed from the dispersed particles in the dispersion which are then recovered.
    Type: Application
    Filed: June 14, 2006
    Publication date: December 20, 2007
    Inventors: Xin Jin, Lloyd A. Lobo, Dinesh Tyagi
  • Chilled finish roller system and method
    Publication number: 20070280758
    Abstract: An apparatus for fixing of toner onto a receiver, including: a non-contact fuser capable of fusing one or more layers of toner on a receiver such that one or more toner layers reach a fusing temperature above a glass transition temperature. The apparatus also includes one or more cooling finish rollers located downstream from the non-contact fuser to lower the toner temperature.
    Type: Application
    Filed: June 1, 2006
    Publication date: December 6, 2007
    Inventors: Andrew Ciaschi, Dinesh Tyagi, James H. Hurst, Arun Chowdry, Eric C. Stelter, Robert D. Bobo, Muhammed Aslam
  • Process and printing machine for the use of liquid print colors
    Patent number: 7298994
    Abstract: Using liquid print color in a printing process in which the print color is transferred from one transfer device onto another transfer device and/or onto a printing medium. To improve handling of the print color, in particular, to optimize it, preferably to avoid adversely affecting transference of the print color and at the same time to avoid adverse effects upon the printing medium, at least one liquid component of the print color is reduced.
    Type: Grant
    Filed: April 16, 2004
    Date of Patent: November 20, 2007
    Assignee: Eastman Kodak Company
    Inventors: Frank-Michael Morgenweck, Domingo Rohde, Detlef Schulze-Hagenest, Dinesh Tyagi