Patents by Inventor Andrew Irwin Bellingham

Andrew Irwin Bellingham 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).

  • Process for the separation of tungsten and molybdenum
    Patent number: 3939245
    Abstract: The known process of separating molybdenum from a tungsten-molybdenum containing alkaline solution has been improved by carrying out the chemical reaction between the solution treated with sulphuric acid and an added sodium bisulphide solution in a continuous process within a multi-stage stirred-tank reactor system, whereby the freed hydrogen sulphide is recycled for absorption by the alkaline solution thus reducing substantially the amount of additional sulphuric acid required for the reaction.
    Type: Grant
    Filed: November 14, 1974
    Date of Patent: February 17, 1976
    Assignee: Warman Equipment (International) Limited
    Inventor: Andrew Irwin Bellingham