Patents by Inventor Hans R. Grashof

Hans R. Grashof 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: 5955190
    Abstract: The present invention is a photographic paper which includes a paper sheet with a polyolefin resin layer on each surface of the paper sheet. A print retaining antistatic layer having a dry coverage of from 10 mg/m.sup.2 to 10000 mg/m.sup.2 is superposed on one of the free surfaces of the polyolefin layers. The print retaining antistatic layer includes a smectite clay and a film forming polymeric binder having a glass transition temperature (Tg) less than 30.degree. which does not intercalate inside and/or exfoliate the smectite clay. In an alternate embodiment the photographic paper includes a silver halide emulsion layer on the other free surface of the resin coated paper sheet.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: September 21, 1999
    Assignee: Eastman Kodak Company
    Inventors: Debasis Majumdar, Hans R. Grashof, Robert J. Kress
  • Patent number: 5895724
    Abstract: The present invention is recyclable photographic film base which includes a cellulose acetate support. An antistatic layer is superposed on one side of the support and includes an antistatic agent. A barrier layer comprising a polymeric composition having a glass transition temperature of less than 90.degree. C. overlies the antistatic layer. In a preferred embodiment the polymeric composition of the barrier layer in poly(isobutyl methacrylate).
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: April 20, 1999
    Assignee: Eastman Kodak Company
    Inventors: David M. Teegarden, Raymond T. Jones, Hans R. Grashof
  • Patent number: 5174923
    Abstract: The present invention provides an antistatic composition comprising a binder, a cyclic phosphazene, and a salt that complexes with the cyclic phosphazene. The cyclic phosphazene has the general formula ##STR1## wherein x is 3 or 4.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: December 29, 1992
    Assignee: Eastman Kodak Company
    Inventors: Janglin Chen, Wayne T. Ferrar, Hans R. Grashof, Akemi S. Marshall
  • Patent number: 4971897
    Abstract: The present invention provides an antistatic composition comprising a binder, a cyclic phosphazene, and a salt that complexes with the cyclic phosphazene. The cyclic phosphazene has the general formula ##STR1## wherein x is 3 or 4.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: November 20, 1990
    Assignee: Eastman Kodak Company
    Inventors: Janglin Chen, Wayne T. Ferrar, Hans R. Grashof, Akemi S. Marshall
  • Patent number: 4601966
    Abstract: An electrographic, dry two-component developer composition is disclosed comprising triboelectrically charged carrier particles and oppositely charged toner particles. The toner particles contain, as a binder, an amorphous, random polyester-amide containing amide linkages in the polymer backbone and is derived from certain dicarboxylic acids, compounds containing primary amino groups and compounds containing hydroxyl groups. A process for using the developer composition to form toner image copies of an original is also disclosed.
    Type: Grant
    Filed: January 2, 1985
    Date of Patent: July 22, 1986
    Assignee: Eastman Kodak Company
    Inventors: Hans R. Grashof, Hsin-Chia Kan, M. Akram Sandhu, John F. Wright, Paul D. Yacobucci
  • Patent number: 4578333
    Abstract: In photoconductive elements having a conductive support, a charge generation layer containing a photoconductive pigment such as a perylene compound and a charge transport layer, an acrylonitrile copolymer interlayer is disposed between the charge generating layer and the support. This interlayer provides the element with improved adhesion and increased photosensitivity.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: March 25, 1986
    Assignee: Eastman Kodak Company
    Inventors: William J. Staudenmayer, Tsang J. Chen, Paul M. Borsenberger, Hans R. Grashof