Patents by Inventor John K. Olby

John K. Olby 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).

  • Method of preventing glaze defects
    Patent number: 4806507
    Abstract: A method of preventing glaze defects occurring when using pigments which are provided by inclusion in zirconium silicate (zircon) comprises the incorporation into the glaze composition of an additive which is zirconium oxide, zirconium silicate, arsenic trioxide, antimony trioxide, ceric oxide, or a mixture thereof, or a precursor therefor in an amount sufficient to reduce or prevent glaze defects.
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: February 21, 1989
    Assignee: Cookson Group PLC
    Inventor: John K. Olby
  • Ceramic pigment
    Patent number: 4486236
    Abstract: A grey ceramic pigment or stain which consists of zircon including, as the colorant, molybdenum sulphide or a mixture of molybdenum sulphide and molybdenum selenide.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: December 4, 1984
    Assignee: HMR Group Limited
    Inventor: John K. Olby