Patents Assigned to Societe Anonyme Dite "Plymouth Francaise"
  • Signaling material and method for protecting subterranean structures
    Patent number: 4654639
    Abstract: A pipeline or other subterranean structure is protected by burying above it a signaling material in the form of a continuous support of a material having low resistance to rupture by carrying at least one row of spaced apart strip sections of a high resistance to rupture. Because the strip sections form a discontinuous band, when encountered by the excavator, the support ruptures and the strip sections can only be pulled and remain unsevered so that free ends of the sections are readily visible to the excavator operator.
    Type: Grant
    Filed: September 6, 1984
    Date of Patent: March 31, 1987
    Assignee: Societe Anonyme Dite "Plymouth Francaise"
    Inventor: Arnaud De Courville