Patents by Inventor William P. Cottrill

William P. Cottrill 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).

  • Unloader for hopper cars and method
    Patent number: 4295775
    Abstract: A method and an apparatus for unloading hopper cars. The method includes the steps of placing a tube in the vicinity of an open hopper of the hopper car, and discharging a blast aerator through the tube. The apparatus includes a housing rotatably mounting the tube. The tube includes a tip to assist in entering the material to be unloaded. A motor to rotate the tube is mounted in the housing; and, a blast aerator is receivable on the housing. A fitting seals between the stationary blast aerator and the rotatable tube, and the fitting can receive an adapter to vary the size of the blast aerator.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: October 20, 1981
    Assignee: Evacuators, Inc.
    Inventors: William P. Cottrill, Andrew J. Cisternino