TREA

Charcon Tunnels Limited

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Patents Grantslast 30 patents

  • Information Patent Grant

    Joints between elements
    • Patent number 4,969,769
    • Issue date Nov 13, 1990
    • Charcon Tunnels Limited
    • Samuel B. H. Mitchell
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Tunnel lining rings
    • Patent number 4,452,549
    • Issue date Jun 5, 1984
    • Charcon Tunnels Limited
    • Anthony J. R. Hart
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Tunnel linings
    • Patent number 4,397,583
    • Issue date Aug 9, 1983
    • Charcon Tunnels Limited
    • Thomas E. Horncy
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Tunnelling shields
    • Patent number 3,969,906
    • Issue date Jul 20, 1976
    • Charcon Tunnels Limited
    • Rupert John Sidney McBean
    • E21 - EARTH DRILLING MINING

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