Patents Assigned to Alfred T. Francis
  • Temporary manhole cover and method
    Patent number: 5529431
    Abstract: A temporary manhole cover constructed of glass fiber reinforced resin grate fits into the standard manhole opening is strong enough to support a motor vehicle and light enough to be lifted out from below or above and also includes a cut out to the edge for pipes, tubing, and wires to be trained through the opening down the manhole.
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: June 25, 1996
    Assignees: Alfred T. Francis, Thomas V. Walsh
    Inventor: Thomas V. Walsh