Patents Assigned to Perimeter Defense Technologies LPO
  • Anti-terrorist road block
    Patent number: 6997638
    Abstract: A road block having an extensible bollard that is manually or electronically actuated by a powerful spring force for slow extension, and by both the spring and a power lift for rapid extension.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: February 14, 2006
    Assignee: Perimeter Defense Technologies LPO
    Inventors: Clifford J. Hensley, Robert C. Herrin, David L. Stice, Robert L. Sims