Patents by Inventor Allen M. Ammerman

Allen M. Ammerman 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 extracting bitumen from tar sands
    Patent number: 4229281
    Abstract: Bitumen is recovered from tar sand by extraction with a solvent. The bitumen solution is washed with water containing a cationic surfactant in order to remove sand fines therefrom.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: October 21, 1980
    Assignee: Phillips Petroleum Company
    Inventors: Henry E. Alquist, Allen M. Ammerman