Patents by Inventor Nigel B. Smith

Nigel B. Smith 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).

  • Pigmentary material
    Patent number: 5795940
    Abstract: Colour concentrate pellets for pigmenting polyvinyl chloride are substantially all of diameter 0.1 to 3 mm and comprise pigment dispersed in a carrier comprising ethylene-vinyl acetate polymer which is ethylene-vinyl acetate copolymer and/or alloy thereof with polyethylene, the polymer having a vinyl acetate content of 13-28% by weight and a melt flow index (as measured by the method of ASTM D1238 using a 2.16 kg weight at 190.degree. C.) of 3.5-150 g/10 minutes, the pellets comprising at least 30% by weight of the pigment and at least 10% by weight of the polymer.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: August 18, 1998
    Assignee: Cookson Matthey Ceramics PLC
    Inventors: Roy W. J. Pearce, Nigel B. Smith