Patents by Inventor Radha Sen

Radha Sen 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).

  • Publication number: 20080233314
    Abstract: A coating for a substrate is formed by milling cationic pigment particles in the presence of a water-soluble polymer, where the water-soluble polymer acts as a binder and a dispersant for the cationic pigment particles.
    Type: Application
    Filed: March 22, 2007
    Publication date: September 25, 2008
    Inventors: Radha Sen, Richard J. Mcmanus
  • Publication number: 20080124500
    Abstract: A method of forming a print medium comprising coating at least one side of a base substrate with anionically-charged nano-milled calcium carbonate that has been mixed with a cationic conversion agent to convert the coating to a cationically-charged coating, where a primary size of particles of the nano-milled calcium carbonate is 10-20 nm or smaller.
    Type: Application
    Filed: November 27, 2006
    Publication date: May 29, 2008
    Inventors: Silke Courtenay, Radha Sen
  • Publication number: 20070264449
    Abstract: A method for forming a printable coating includes providing a calcium carbonate, combining a dispersant with the calcium carbonate, nanomilling the calcium carbonate and the dispersant to inhibit re-floccing of the nanomilled calcium carbonate, and combining the mixture with a binder at alkaline pH. According to one exemplary embodiment, the coating may be applied to one or more sides of a media substrate.
    Type: Application
    Filed: May 10, 2006
    Publication date: November 15, 2007
    Inventors: Silke Courtenay, Radha Sen
  • Publication number: 20070116904
    Abstract: An ink receiving substrate includes a base substrate, and a microporous coating formed on the base substrate, wherein the microporous coating includes a high surface area fumed alumina and a high molecular weight polyvinyl alcohol (PVA) binder.
    Type: Application
    Filed: November 23, 2005
    Publication date: May 24, 2007
    Inventor: Radha Sen
  • Publication number: 20070098928
    Abstract: The various embodiments involve marking fluid receptors, methods of their manufacture and use, and media produced using such receptors. Marking fluid receptive coatings of the various embodiments utilize calcium carbonate having controlled sizing of primary particles and their agglomeration.
    Type: Application
    Filed: October 27, 2005
    Publication date: May 3, 2007
    Inventors: Radha Sen, Richard Mcmanus
  • Patent number: 7165836
    Abstract: Mutilayer media is being developed which has inner ink-receiving micro-porous layer and an outer sealable porous surface coat, or topcoat. Ink printed on the media passes through the topcoat, and is absorbed by, or reacts with the inner ink-receiving layer. A thermal printhead is attached downstream of the print zone so that it passes over the area that was previously printed, and heats the topcoat. Where the topcoat is heated, the pores are closed and the closed pores provide a protective layer between the inner ink-receiving layer and the environment.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: January 23, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Eric L. Ahlvin, Dan M. Weeks, Radha Sen
  • Patent number: 7150522
    Abstract: A process is provided that allows the production of an ink-jet recording media by applying a sealable topcoat to an ink-receptive coating on a substrate. A porous ink-receptive coating including a plurality of pores is applied to a surface of the substrate. An anionic porous topcoat consisting essentially of polymer particles having a Tg in the range of 60° to 100° C. and a size less than 250 nanometers is applied on the porous ink-receptive coating. The topcoat is then dried at an elevated temperature and an image is printed on the topcoat of the ink-jet recording media using a conventional ink-jet printer. The topcoat is then heated until it becomes fused by using a heating device. The media formed provides the advantages of improved air fade resistance, good image quality and high gloss.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: December 19, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Radha Sen
  • Patent number: 7147317
    Abstract: A print medium having a heat-sealable layer supported by an ink receiving layer, the heat-sealable layer having a first component and a second component. The first component and the second component have different particle sizes and different glass transition temperatures. A method of producing the print medium is also disclosed. The print medium is used to produce a photographic-quality image by applying inkjet ink to the print medium. The heat-sealable layer of the print medium is sealed by exposing the layer to a temperature above the glass transition temperatures of the two components. An inkjet printer used to apply inkjet ink to the print medium may include a radiant heater.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: December 12, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Radha Sen
  • Patent number: 7063418
    Abstract: The present invention relates to a print medium with improved resistance to airfade. The print medium is coated with a high molecular weight additive having low volatility. The high molecular weight additive is a monomeric or oligomeric compound that has a molecular weight of greater than approximately 1000. The high molecular weight additive is a hindered amine light stabilizer or a fixative. The present invention also relates to a method of producing a print medium with improved airfastness. The method comprises coating a print medium with a high molecular weight additive having low volatility. An image is then printed on the coated print medium and subjected to at least one atmospheric gas. The airfastness of the printed image is measured and compared to the airfastness of an image printed on an uncoated print medium.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: June 20, 2006
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Radha Sen
  • Publication number: 20060083872
    Abstract: A method of producing a print medium to reduce problems associated with the gradual dye-fade and color-shift of inks over time, and to provide improved resistance to physical handling is provided Specifically, a method can comprise steps of coating a media substrate with a porous coating composition of semi-metal oxide or metal oxide particulates to form a porous ink receiving layer, coating the porous ink-receiving layer with a latex layer configured to allow an ink-jet ink to be received at the porous ink-receiving layer, printing ink-jet ink on at least a portion of the latex layer to form ink-associated latex regions exclusive of non-printed latex regions, and heating the latex layer. The ink-jet ink can include an ink vehicle, a colorant, and a film promoting additive that lowers the film forming temperature of the latex particulates in the ink-associated latex regions. Upon heating, the ink-associated latex regions form a continuous film, and non-printed latex regions do not form a continuous film.
    Type: Application
    Filed: February 8, 2005
    Publication date: April 20, 2006
    Inventors: Radha Sen, Juan Salazar, Jayprakash Bhatt
  • Publication number: 20060078695
    Abstract: Print media and systems for preparing a fused ink-jet image are disclosed. One exemplary print medium, among others, includes a substrate, a porous ink-receiving layer disposed on the substrate, and a porous surface layer disposed on the porous ink-receiving layer. The porous surface layer includes polymer particles and a non-ionic stabilizing surfactant.
    Type: Application
    Filed: January 27, 2005
    Publication date: April 13, 2006
    Inventors: Radha Sen, Robert Beer
  • Publication number: 20060068178
    Abstract: A method and coating for printing a substantially permanent and smudge, water, and air fade resistant image on recording media is herein disclosed. The method involves the steps of formulating the coating, applying the coating to the recording media, drying the coating, forming an image on the coated recording media, drying the image on the recording media to remove the solvents from the colorants used to form the image, and fusing the coating to protective film over the recording media that substantially encapsulates the colorants used to print the image, thereby rendering the image substantially smudge, water, and air fade resistant. The coating includes a quantity of fusible particles admixed with a binder. In one formulation, the coating also includes a mordant. The coating itself is capable of absorbing and retaining colorants applied thereto and may therefore be used on absorbent or non-absorbent recording media.
    Type: Application
    Filed: September 28, 2004
    Publication date: March 30, 2006
    Inventors: Molly Hladik, David Rossing, Radha Sen, Steven Webb, Richard McManus
  • Publication number: 20060045999
    Abstract: Fusible print media, systems for preparing a fused ink-jet image, and methods of preparing a fused ink-jet image, are provided. One exemplary fusible print medium, among others, includes a substrate and an ink-receiving layer disposed on the substrate. The ink-receiving layer includes a first layer having ultrafine polymer particles and a second layer having hollow beads.
    Type: Application
    Filed: August 25, 2004
    Publication date: March 2, 2006
    Inventors: Tienteh Chen, Radha Sen
  • Publication number: 20060038871
    Abstract: A fusible print medium for use in inkjet printing. The fusible print medium includes a substrate and a fusible layer, the fusible layer comprising at least one organic pigment and at least one solid plasticizer. A method of producing the fusible print medium and a method of producing a photographic quality image are also disclosed.
    Type: Application
    Filed: August 23, 2004
    Publication date: February 23, 2006
    Inventors: Tienteh Chen, Radha Sen
  • Publication number: 20050287311
    Abstract: Briefly described, embodiments of this disclosure include fusible print media, methods of making fusible print media, and systems for preparing a fused ink-jet image. One exemplary embodiment of the fusible print medium, among others, includes a substrate and an ink-receiving layer disposed on the substrate. The ink-receiving layer includes a plurality of hollow polymer beads having substantially the same diameter.
    Type: Application
    Filed: June 24, 2004
    Publication date: December 29, 2005
    Inventors: Tienteh Chen, Radha Sen, Steven Webb, Anne Kelly-Rowley, Loretta Ann Page
  • Publication number: 20050287313
    Abstract: Briefly described, embodiments of this disclosure include fusible print media, methods of making fusible print media, and systems for preparing a fused ink-jet image. One exemplary embodiment of the fusible print medium, among others, includes a substrate and an ink-receiving layer disposed on the substrate. The ink-receiving layer includes a plurality of hollow polymer beads having substantially the same diameter.
    Type: Application
    Filed: October 12, 2004
    Publication date: December 29, 2005
    Inventors: Tienteh Chen, Radha Sen, Steven Webb, Anne Kelly-Rowley, Loretta Grezzo Page
  • Publication number: 20050191440
    Abstract: The present invention relates to a print medium with improved resistance to airfade. The print medium is coated with a high molecular weight additive having low volatility. The high molecular weight additive is a monomeric or oligomeric compound that has a molecular weight of greater than approximately 1000. The high molecular weight additive is a hindered amine light stabilizer or a fixative. The present invention also relates to a method of producing a print medium with improved airfastness. The method comprises coating a print medium with a high molecular weight additive having low volatility. An image is then printed on the coated print medium and subjected to at least one atmospheric gas. The airfastness of the printed image is measured and compared to the airfastness of an image printed on an uncoated print medium.
    Type: Application
    Filed: February 9, 2005
    Publication date: September 1, 2005
    Inventor: Radha Sen
  • Publication number: 20050191445
    Abstract: A system for forming a microporous ink receptive coating includes a fusible latex configured to coat a substrate, wherein the fusible latex includes a hard core material and a soft shell material, wherein the latex exhibits self-adhesive properties at a system operation temperature.
    Type: Application
    Filed: February 27, 2004
    Publication date: September 1, 2005
    Inventors: Radha Sen, Tienteh Chen, Robert Beer, Kristina Gee
  • Publication number: 20050146590
    Abstract: A print medium having a heat-sealable layer comprised of a first component and a second component. The first component and the second component have different particle sizes and different glass transition temperatures. A method of producing the print medium is also disclosed. The print medium is used to produce a photographic-quality image by applying inkjet ink to the print medium. The heat-sealable layer of the print medium is sealed by exposing the layer to a temperature above the glass transition temperatures of the two components. An inkjet printer used to apply inkjet ink to the print medium may include a radiant heater.
    Type: Application
    Filed: February 14, 2005
    Publication date: July 7, 2005
    Inventor: Radha Sen
  • Publication number: 20050118359
    Abstract: A process is provided that allows the production of an ink-jet recording media by applying a sealable topcoat to an ink-receptive coating on a substrate. A porous ink-receptive coating comprising a plurality of pores is applied to a surface of the substrate. An anionic porous topcoat comprising polymer particles having a Tg in the range of 60° to 100° C. and a size less than 250 nanometers is applied on the porous ink-receptive coating. The topcoat is then dried at an elevated temperature and an image is printed on the topcoat of the ink-jet recording media using a conventional ink-jet printer. The topcoat is then heated until it becomes fused by using a heating device. The media formed provides the advantages of improved air fade resistance, good image quality and high gloss.
    Type: Application
    Filed: November 5, 2004
    Publication date: June 2, 2005
    Inventor: Radha Sen