Patents by Inventor Simon R. Stebbing

Simon R. Stebbing 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).

  • Amorphous silica
    Patent number: 7662363
    Abstract: An amorphous silica suitable for use in a dental composition has a weight mean particle size in the range 3 to 15 ?m with at least 90 per cent by weight of particles having a size below 20 ?m, a Radioactive Dentine Abrasion (RDA) determined on an aqueous slurry of the silica powder of 100 to 220, a Pellicle Cleaning Ratio (PCR), when incorporated in a dental composition at 10 per cent by weight, greater than 85, the ratio of PCR to RDA being in the range 0.4:1 to less than 1:1 and having a Plastics Abrasion Value (PAV) in the range 11 to 19. A silica having the above properties is prepared by a precipitation route. The silica made available by the invention is also useful as an anti-blocking agent in plastics.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: February 16, 2010
    Assignee: PQ Silicas UK Limited
    Inventors: Peter W. Stanier, Simon R. Stebbing