TREA

without essential advancing shifting devices

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Industry

  • CPC
  • E21D23/0069
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D23/00Mine roof supports for step- by- step movement

Current Industry

E21D23/0069without essential advancing shifting devices
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3631681
    • Patent number 3,631,681
    • Issue date Jan 4, 1972
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3490243
    • Patent number 3,490,243
    • Issue date Jan 20, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3490244
    • Patent number 3,490,244
    • Issue date Jan 20, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3478522
    • Patent number 3,478,522
    • Issue date Nov 18, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3448584
    • Patent number 3,448,584
    • Issue date Jun 10, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3437010
    • Patent number 3,437,010
    • Issue date Apr 8, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3435620
    • Patent number 3,435,620
    • Issue date Apr 1, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3426649
    • Patent number 3,426,649
    • Issue date Feb 11, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3425229
    • Patent number 3,425,229
    • Issue date Feb 4, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3415065
    • Patent number 3,415,065
    • Issue date Dec 10, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3383866
    • Patent number 3,383,866
    • Issue date May 21, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3373551
    • Patent number 3,373,551
    • Issue date Mar 19, 1968
    • D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
  • Information Patent Grant

    3372551
    • Patent number 3,372,551
    • Issue date Mar 12, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3371901
    • Patent number 3,371,901
    • Issue date Mar 5, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3362169
    • Patent number 3,362,169
    • Issue date Jan 9, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3333425
    • Patent number 3,333,425
    • Issue date Aug 1, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3324664
    • Patent number 3,324,664
    • Issue date Jun 13, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3302529
    • Patent number 3,302,529
    • Issue date Feb 7, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3241801
    • Patent number 3,241,801
    • Issue date Mar 22, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3228302
    • Patent number 3,228,302
    • Issue date Jan 11, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3218812
    • Patent number 3,218,812
    • Issue date Nov 23, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3217498
    • Patent number 3,217,498
    • Issue date Nov 16, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3197966
    • Patent number 3,197,966
    • Issue date Aug 3, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3197168
    • Patent number 3,197,168
    • Issue date Jul 27, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3164066
    • Patent number 3,164,066
    • Issue date Jan 5, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3159003
    • Patent number 3,159,003
    • Issue date Dec 1, 1964
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3127748
    • Patent number 3,127,748
    • Issue date Apr 7, 1964
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3012404
    • Patent number 3,012,404
    • Issue date Dec 12, 1961
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2912211
    • Patent number 2,912,211
    • Issue date Nov 10, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1646417
    • Patent number 1,646,417
    • Issue date Oct 25, 1927
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents