Patents Assigned to Shepherd Excavating, Inc.
  • Combination drainage system and radon gas venting system for a structure foundation
    Patent number: 5740638
    Abstract: A combination drainage system and radon gas venting system for a structure foundation as disclosed which utilizes solid rubber particle fill as a free draining and venting medium.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: April 21, 1998
    Assignee: Shepherd Excavating, Inc.
    Inventor: Allen S. Shepherd, III