Patents by Inventor John Drew

John Drew 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).

  • Patent number: 3991515
    Abstract: In a process for chemically stimulating the production of oleoresinous material in association with living wood cells it is advantageous to use a dilute dispersion of primary amine.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: November 16, 1976
    Assignee: SCM Corporation
    Inventor: John Drew
  • Patent number: 3985634
    Abstract: Apparatus for elctrolytically removing silver from a spent photographic processing solution. A thin flexible cathode sheet is removably fitted within the inside periphery of a tank which receives the solution. A lid unit is removably secured over the tank and rotatably supports an anode assembly extending within the tank. A power unit is removably secured on the lid unit and carries a motor for driving the anode assembly to circulate the solution. An electric power conducting circuit in the power unit is automatically connected to the anode assembly and the cathode when the power unit is secured.
    Type: Grant
    Filed: January 27, 1975
    Date of Patent: October 12, 1976
    Inventors: Kay R. Larson, John Drew, Howard Ott