Patents Assigned to John J. Brennan Construction Co., Inc
  • Trench shoring extraction device
    Patent number: 7658573
    Abstract: A hydraulic lifting device including a main beam, two or more connection plates fixedly connected to the main beam, at least two legs, each leg pivotably attached to two of the plates, at least two hydraulic cylinders, each cylinder disposed between the beam and one of the legs, and two or more load connectors.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: February 9, 2010
    Assignee: John J. Brennan Construction Co., Inc
    Inventor: Alan D. Thompson