Patents by Inventor Robert Watsfeldt

Robert Watsfeldt 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).

  • Pigment compositions and process of shading
    Publication number: 20040040682
    Abstract: Compositions comprising
    Type: Application
    Filed: July 17, 2003
    Publication date: March 4, 2004
    Inventors: Ian William Knowles, Robert Watsfeldt, Kjell Erik Kumlin
  • Pigment compositions and process of shading
    Patent number: 6620235
    Abstract: Compositions comprising a) a mixture of i) C.I. Pigment Violet 19 together with either C.I. Pigment Blue 15 or C.I. Pigment Blue 60, or ii) C.I. Pigment Red 177 together with either C.I. Pigment Blue 15 or C.I. Pigment Blue 60, and b) a dispersant, c) optionally a biocide, and d) water. A process for shading of paper using said compositions or by applying separate pigment dispersions of a) C.I. Pigment Violet 19 and either C.I. Pigment Blue 15 or C.I. Pigment Blue 60, or b) C.I. Pigment Red 177 and either C.I. Pigment Blue 15 or C.I. Pigment Blue 60.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: September 16, 2003
    Assignees: Ciba Specialty Chemicals Corporation, Stora Enso AB
    Inventors: Ian William Knowles, Robert Watsfeldt, Kjell Erik Kumlin