Patents by Inventor Patrick T. Grant

Patrick T. Grant 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: 4380213
    Abstract: The perforated walls of conventional fish cages become partially blocked after prolonged use and the cage of the present invention offers a relatively simple means of preventing or remedying this defect by periodically rotating the cage to expose each wall in turn for cleaning or replacement. In the embodiment of FIG. 1, the cage (8) is provided with four control devices (A-D) which can be filled with air or water (via rotation valves 18 A-D) as appropriate to effect the desired rotation. These same devices can also be used to control the buoyancy of the cage and hence the level at which it floats in the ambient water preferably just on or under the surface.
    Type: Grant
    Filed: January 26, 1982
    Date of Patent: April 19, 1983
    Assignee: National Research Development Corporation
    Inventors: Albert Blair, Patrick T. Grant
  • Patent number: 4351268
    Abstract: The perforated walls of conventional fish cages become partially blocked after prolonged use and the cage of the present invention offers a relatively simple means of preventing or remedying this defect by periodically rotating the cage to expose each wall in turn for cleaning or replacement. In the embodiment of FIG. 1, the cage (8) is provided with four control devices (A-D) which can be filled with air or water (via rotation valves 18 A-D) as appropriate to effect the desired rotation. These same devices can also be used to control the buoyancy of the cage and hence the level at which it floats in the ambient water preferably just on or under the surface.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: September 28, 1982
    Assignee: National Research Development Corporation
    Inventors: Albert Blair, Patrick T. Grant