Patents by Inventor Andrew Francis Rankin

Andrew Francis Rankin 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).

  • Flexible wall pump
    Patent number: 4111616
    Abstract: A sludge pump which includes successive inlet, work and outlet chambers interconnected by one-way valves. Means is provided to periodically vary the volume of the work chamber thereby to induce transfer of fluid through the work chamber from the inlet to the outlet chamber. Also disclosed is a method of removing sludge from a sludge collection pit by periodic variation of the volume of an enclosed chamber in communication with the pit and with a chosen disposal site.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: September 5, 1978
    Inventor: Andrew Francis Rankin