Patents by Inventor Richard Gerrard Shaw Stewart

Richard Gerrard Shaw Stewart 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).

  • Process for producing clay compositions for use in slip casting
    Patent number: 5972263
    Abstract: A method of improving the strength and/or plasticity of a clay composition comprising a kandite clay and an organic additive comprising at least one water soluble compound having a plurality of basic groups wherein the organic additive is present in an amount of from about 0.05% by weight to about 0.5% by weight based on the dry weight of the kandite clay present, which method comprises treating the kandite clay by adding thereto a monovalent ion activated smectite clay or a monovalent ion activating agent for a smectite clay or both whereby the amount of monovalent ion activated non-calcined smectite clay present in the clay composition is adjusted to be in the range from about 1% by weight to about 5% by weight based upon the dry weight of the kandite clay present.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: October 26, 1999
    Assignee: ECC International Ltd.
    Inventors: Howard Goodman, Christopher Stirling Hogg, Richard Gerrard Shaw Stewart