Patents by Inventor Derek L. Macartney

Derek L. Macartney 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: 4500228
    Abstract: An apparatus for transporting granular materials is disclosed comprising a first conduit having an inlet for introducing the granular material, and transport pump for transporting the material through the first conduit. A nozzle provides a compressible fluid at a relatively high pressure for disaggregating the granular material within the first conduit, the material then proceeds from the first conduit into a second conduit. A relatively low pressure and high volume compressible fluid is supplied to the material to propel the material through the second conduit. There is also provided an adjustment means for changing the position of the nozzle within the first conduit. By adjusting the position of the nozzle, the apparatus can maintain disaggregation when the physical or chemical properties of the granular material are changed thereby preventing clogging of the apparatus due to insufficient disaggregation.
    Type: Grant
    Filed: April 15, 1982
    Date of Patent: February 19, 1985
    Assignee: Joy Manufacturing Company
    Inventors: Robert C. McDonald, Derek L. Macartney