Patents by Inventor Roderick R. Roy

Roderick R. Roy 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).

  • Direct hydraulic drive for large flotation cells
    Patent number: 5284249
    Abstract: A flotation apparatus for floating minerals from fluid containing minerals in particulate form. The flotation apparatus includes a hydraulic motor directly connected to a drive shaft for driving a rotor located in the flotation cell, the hydraulic motor being powered by a hydraulic power pack having dual gear pumps to circulate hydraulic fluid at pressures of up to 2900 psi to drive the hydraulic motor. The dual gear pumps include a smaller gear pump for developing high pressure at low flow for quick, soft start of the flotation apparatus. Once started, the larger pump automatically takes over to provide high flow at lower pressure to develop rotor speed of approximately 160 RPM.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: February 8, 1994
    Assignee: Dorr-Oliver Incorporated
    Inventors: George A. Lawrence, Andres Paredes, Roderick R. Roy