Patents Assigned to Scripto-Tokai, Inc.
  • Initially erasable ball pen ink
    Patent number: 4738725
    Abstract: A ball pen ink of transiently erasable type to be dispensed from a pressurized ball pen incorporates an elastommeric polymer, pigment and a mixed solvent system. The mixed solvent system includes a volatile solvent component, a non-volatile solvent component and a non-volatile solvent/plasticizer component in such relative amounts and with relation to the elastomer and pigment combination as achieves a balance between ink viscosity and thixotropy to provide good writing qualities.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: April 19, 1988
    Assignee: Scripto-Tokai, Inc.
    Inventors: Phillip M. Daugherty, Robert R. Massey