Patents by Inventor Stewart W. Roach

Stewart W. Roach 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).

  • Composite pumping system
    Patent number: 4558990
    Abstract: An article transfer pumping system combining the effects of a jet pump and an air lift pump to minimize article damage while increasing lift capability and overall system efficiency. Air lift pump placement adjacent the pump inlet aerates the rising column of water with articles such as fish, even large salmon, being raised by the jet pump, whereas jet pump placement adjacent the discharge end of the conduit increases pump efficiency.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: December 17, 1985
    Assignee: Marco Seattle, Inc.
    Inventor: Stewart W. Roach
  • Transfer system for fish and similar articles
    Patent number: 4551042
    Abstract: Pumping efficiency for fish and other articles has been achieved far beyond expectations. By extracting water and adding air at a location in the pumping system higher than the initial air injection point, thereby excluding a certain percentage of the water, efficiency is not only increased but variable control capabilities are achieved.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: November 5, 1985
    Assignee: Marco Seattle, Inc.
    Inventors: Stanley R. Hagedorn, Stewart W. Roach