Patents by Inventor Dereck R. Johns

Dereck R. Johns 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 fine metal powders
    Patent number: 4239159
    Abstract: Metal particles which are ductile at ambient temperature can be comminuted by being passed through a first impact mill at ambient temperature to increase their length to thickness ratio, embrittled, and then comminuted in a second impact mill.
    Type: Grant
    Filed: February 13, 1979
    Date of Patent: December 16, 1980
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Dereck R. Johns