Patents by Inventor Shawn P. Lambert

Shawn P. Lambert 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).

  • Ink jet recording sheet
    Patent number: 5942335
    Abstract: An ink jet recording sheet comprises a support carrying an ink-receiving layer, this layer comprising a hydrophilic polymer, preferably poly(vinyl alcohol) and a poly(vinylpyridine). The images formed using this sheet display good water fastness.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: August 24, 1999
    Assignee: Polaroid Corporation
    Inventors: Yung T. Chen, Gerald P. Harwood, Jr., Shawn P. Lambert, Kenneth J. McCarthy, Richard J. Murphy, Michael S. Viola, Xiaojia Z. Wang
  • Process for the polymerization of 4-vinyl pyridine monomers
    Patent number: 5861230
    Abstract: There is described a novel process of polymerizing 4-vinyl pyridine monomer in an aqueous polymerization system which comprises preparing an aqueous solution of polyvinyl alcohol, and contacting said aqueous solution of a polyvinyl alcohol with less than about 10% by weight of 4-vinyl pyridine monomer and a water-soluble initiator capable of decomposing to give free radicals.The resultant dispersion of the novel polymerization process comprises a homogeneous, i.e., weight average molecular weight and particle size, poly-4-vinylpyridine, with no appreciable residual 4-vinyl pyridine monomer.The resultant dispersion may be used to coat image- and ink-receiving layers of image-recording materials and ink jet recording sheets, respectively.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: January 19, 1999
    Assignee: Polaroid Corporation
    Inventors: Shawn P. Lambert, Xiaojia Z. Wang