Patents by Inventor David John Stamper

David John Stamper 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).

  • Production of hydrogen fluoride
    Patent number: 4089936
    Abstract: Ammonium fluoride is converted into a bifluoride by reaction with KF to form KF.HF, converting the latter to NaF.HF and heating said sodium bifluoride to form a solid product comprising NaF.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: May 16, 1978
    Assignee: Goulding Chemicals Limited
    Inventors: William Henry Thompson, Ralph Eric Worthington, David John Stamper
  • Production of hydrogen fluoride
    Patent number: 4062929
    Abstract: Hydrogen fluoride is produced from hydrofluosilicic acid. The hydrofluosilicic acid is reacted with ammonia. An aqueous solution of ammonium fluoride thus produced is fed with partly recycled alkali metal fluoride to a continuously operated reactor where a bifluoride of the alkali metal is formed in aqueous solution. Reaction mixture is continuously withdrawn and solid alkali metal bifluoride crystallized therefrom. The mother liquor is recycled to the reactor. The solid alkali metal bifluoride is decomposed by heat to produce hydrogen fluoride and solid alkali metal fluoride. The alkali metal fluoride is recycled to the reactor.
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: December 13, 1977
    Assignee: Fitzwilton Limited
    Inventors: William Henry Thompson, Ralph Eric Worthington, David John Stamper
  • Production of hydrogen fluoride
    Patent number: 4056604
    Abstract: Hydrogen fluoride is recovered from hydrofluosilicic acid by-product of phosphoric acid manufacture. The hydrofluosilicic acid effluent is reacted with ammonia to form ammonium fluoride which is converted to a bifluoride by reaction with an excess of soluble metal fluoride. The bifluoride is readily recoverable and decomposable to yield hydrogen fluoride.
    Type: Grant
    Filed: August 20, 1973
    Date of Patent: November 1, 1977
    Inventors: William Henry Thompson, Ralph Eric Worthington, David John Stamper