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).

  • Patent number: 6869648
    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: June 18, 2002
    Date of Patent: March 22, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Radha Sen
  • Patent number: 6869649
    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: Grant
    Filed: March 12, 2003
    Date of Patent: March 22, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Radha Sen
  • Publication number: 20040180151
    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 ink-jet 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: March 12, 2003
    Publication date: September 16, 2004
    Inventor: Radha Sen
  • Publication number: 20040109957
    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: December 4, 2002
    Publication date: June 10, 2004
    Inventor: Radha Sen
  • Patent number: 6689544
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: February 10, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
  • Publication number: 20030235706
    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: June 18, 2002
    Publication date: December 25, 2003
    Inventor: Radha Sen
  • Publication number: 20020195435
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Application
    Filed: June 13, 2002
    Publication date: December 26, 2002
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Radha Sen, Jyothsna Ram
  • Patent number: 6485839
    Abstract: An ablatable laminar imaging medium useful in the manufacture of a substantially transparent electrode assembly is disclosed. The laminar imaging medium comprises a substrate, a high-index metal oxide layer, an ablatable metallic conductive layer, a high-index conductive metal oxide layer, and an ablation enhancement layer. The ablation enhancement layer has an IR-absorption greater than the IR-absorption of said high-index conductive metal oxide layer and an IR-reflectivity less than the IR-reflectivity of said high-index conductive metal oxide layer. Presence in the laminar imaging medium of the ablation enhancement layer lowers the exposure threshold of the medium and improves ablation accuracy, both—when occasioned in the manufacture of LCD electrode patterns—resulting collectively and ultimately in a more reliably formed electrical architecture, less susceptible to unwanted “shorting”.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: November 26, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: Pradnya V. Nagarkar, James T. Richard, Linda S. Heath, Carl A. Chiulli, Radha Sen, Jyothsna Ram, David W. McCarthy