Patents by Inventor Doris V. Royston

Doris V. 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).

  • Conductive sheet material having an aqueous conductive composition
    Patent number: 4868048
    Abstract: An aqueous conductivising composition for conductivising 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 conductivising 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 conductivised with a synthetic hectorite clay conductivising agent.
    Type: Grant
    Filed: December 9, 1987
    Date of Patent: September 19, 1989
    Assignee: The Wiggins Teape Group Limited
    Inventors: William K. Barr, Doris V. Royston