Patents Assigned to H. B. Contracting Ltd.
  • Buoyancy apparatus
    Patent number: 4037425
    Abstract: A plurality of buoyancy tanks are connected at spaced intervals to a pipeline, each having an opening in the bottom thereof, a remotely-controlled pressure air line is connected to a normally closed water-controlled air inlet valve and an outlet valve of each tank which is closed by said air, and water entering the tank opening the inlet valve and then shutting off of the air pressure in the air line permitting the outlet valve to open.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: July 26, 1977
    Assignee: H. B. Contracting Ltd.
    Inventor: Harry Berg