Patents Assigned to Watts Blake Bearne & Co. PLC
  • Clay bodies of china and ball clays containing heat treated clay combined with raw clay components
    Patent number: 5143871
    Abstract: In a method of preparing a treated clay product, clay is heated such that kalinite in the clay is converted to metakaolin, substantially no mullite being formed. The treated product may be combined with raw ball clay and/or china clay to provide compositions suitable for use in manufacturing china articles. The casting compositions enable the casting step to be accelerated and are particularly suitable for use in pressurized casting methods.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: September 1, 1992
    Assignee: Watts Blake Bearne & Co. PLC
    Inventors: Samuel M. Leese, Dennis Mitchell