Patents by Inventor John D. Sampson

John D. Sampson 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).

  • Mixing equipment
    Patent number: 4408886
    Abstract: Powdered or particulate material, especially cement which is prone to caking, is stored in a fluidized storage container (1) and is conveyed in predetermined amount by conveyor means (15) to a mixer unit (20). The material is mixed with water which is also supplied to the mixer unit to form a grout which can be used in pump packing systems in underground mines. The invention provides simple equipment capable of reliably handling large quantities of cement, and is particularly suited for use underground in coal mines. (References to FIG. 1).
    Type: Grant
    Filed: February 17, 1982
    Date of Patent: October 11, 1983
    Assignee: Coal Industry (Patents) Limited
    Inventors: John D. Sampson, David J. W. Sparrow