Patents by Inventor Raymond S. Williams

Raymond S. Williams 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).

  • Pressurized roller pens and inks for such pens
    Patent number: 4789399
    Abstract: A pressurized roller pen includes a thixotropic viscoelastic ink that is a gel at rest, but becomes a thin liquid under the shearing action of the pen's revolving ball-point. This ink includes a polyacrylic resin polymer, at least one highly polar solvent, at least one solvent of low or medium polarity, and colloidal silica, together with pigments, dyes, surfactants and/or pH modifiers.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: December 6, 1988
    Assignee: Paul C. Fisher
    Inventors: Raymond S. Williams, Paul C. Fisher
  • Erasable ink for ball point pens
    Patent number: 4419464
    Abstract: An erasable ink for use in a ball point pen, particularly in a pressurized cartridge, is a fluid comprising at least 10% w of polyvinyl acetate or a copolymer of ethylene and vinyl acetate, and at least 10% w trichloroethylene. The ink preferably also contains at least 5% w of a solvent boiling in the range of 180.degree.-250.degree. C., a plasticizer boiling above 270.degree. C., a colorant, and a tackifier.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: December 6, 1983
    Assignee: Paul C. Fisher
    Inventors: Raymond S. Williams, Paul C. Fisher
  • Erasable ink for ball point pens comprising trifluoroethylene and vinyl acetate polymers
    Patent number: 4367966
    Abstract: An erasable ink for use in a ball point pen, particularly in a pressurized cartridge, is a fluid comprising at least 10% w of polyvinyl acetate or a copolymer of ethylene and vinyl acetate, and at least 10% w trichloroethylene. The ink preferably also contains at least 5% w of a solvent boiling in the range of 180.degree.-250.degree. C., a plasticizer boiling above 270.degree. C., a colorant, and a tackifier.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: January 11, 1983
    Assignee: Paul C. Fisher
    Inventors: Raymond S. Williams, Paul C. Fisher