Patents by Inventor John C. Darrah

John C. Darrah 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).

  • Air supply system for therapeutic pool
    Patent number: 4166296
    Abstract: An air supply system for a therapeutic pool which allows placement of the air blower at a level below the water surface without danger of damage by water backflow. A check valve prevents gross water backflow to the blower, and a float valve between the check valve and the blower automatically drains any leakage of water through the check valve. The float valve is placed between the check valve and the blower in a manner so as to receive all leakage.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: September 4, 1979
    Assignee: Gerald S. Stein
    Inventors: John L. Darrah, John C. Darrah