Patents by Inventor Vanessa D. Royston

Vanessa D. Royston 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).

  • Aqueous conductivizing composition for conductivizing sheet material
    Patent number: 4739003
    Abstract: An aqueous conductivizing composition for conductivizing paper or other sheet material, for example for producing a conductive base for use in dielectric paper or other electrostatic imaging material, is produced by (a) removing sodium magnesium trifluoride impurity (neighborite) from a synthetic hectorite clay conductivizing agent, and (b) adding a binder. These measures reduce dust formation experienced in production or use of electrostatic imaging material incorporating a base which has been conductivized with a synthetic hectorite clay conductivising agent.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: April 19, 1988
    Assignee: The Wiggins Teape Group Limited
    Inventors: Keith W. Barr, Vanessa D. Royston