Patents Assigned to Keeling & Walker Limited
  • Security printing
    Patent number: 10259255
    Abstract: An article comprising a substrate which carries a doped tin oxide wherein less than 50 mol % of the tin atoms in the tin oxide are substituted with a dopant element.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: April 16, 2019
    Assignees: Inovink Limited, Keeling & Walker Limited
    Inventors: David Malcolm Lewis, Dieter Guhl
  • Production of refractory articles
    Patent number: 4053320
    Abstract: The process for the production of a refractory body comprises comminuting plasma dissociated zircon sand, mixing the comminuted sand with a functional additive for the purpose of reducing the subsequent firing temperature, moulding the resulting mixture to form a body, and finally firing the moulded body until sintering occurs.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: October 11, 1977
    Assignee: Keeling & Walker Limited
    Inventors: John Peter Hugh Williamson, Harry Augustus Morriss