Patents by Inventor Donald MacAskill

Donald MacAskill 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).

  • Heat treatment of particulate materials
    Patent number: 3995987
    Abstract: A multiple-stage calcining system employing different conditions in each calcining stage so that quality, capacity and temperature control can be maximized. Advantage is taken of the difference in ignition temperatures of fuels.
    Type: Grant
    Filed: March 31, 1975
    Date of Patent: December 7, 1976
    Inventor: Donald MacAskill