TREA

without essential shifting devices

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Industry

  • CPC
  • E21D23/0047
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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

E21D23/0047without essential shifting devices
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Equipment system for no-roadway no-coal-pillar retained roadway min...
    • Patent number 11,008,860
    • Issue date May 18, 2021
    • Manchao HE
    • Manchao He
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3885396
    • Patent number 3,885,396
    • Issue date May 27, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3626700
    • Patent number 3,626,700
    • Issue date Dec 14, 1971
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3488966
    • Patent number 3,488,966
    • Issue date Jan 13, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3474628
    • Patent number 3,474,628
    • Issue date Oct 28, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3466875
    • Patent number 3,466,875
    • Issue date Sep 16, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3431737
    • Patent number 3,431,737
    • Issue date Mar 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

    3399927
    • Patent number 3,399,927
    • Issue date Sep 3, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3397543
    • Patent number 3,397,543
    • Issue date Aug 20, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3392533
    • Patent number 3,392,533
    • Issue date Jul 16, 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

    3381480
    • Patent number 3,381,480
    • Issue date May 7, 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

    3365893
    • Patent number 3,365,893
    • Issue date Jan 30, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3355213
    • Patent number 3,355,213
    • Issue date Nov 28, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3313114
    • Patent number 3,313,114
    • Issue date Apr 11, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3289997
    • Patent number 3,289,997
    • Issue date Dec 6, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3240022
    • Patent number 3,240,022
    • Issue date Mar 15, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3201943
    • Patent number 3,201,943
    • Issue date Aug 24, 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

    3192722
    • Patent number 3,192,722
    • Issue date Jul 6, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3186178
    • Patent number 3,186,178
    • Issue date Jun 1, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1946034
    • Patent number 1,946,034
    • Issue date Feb 6, 1934
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1594475
    • Patent number 1,594,475
    • Issue date Aug 3, 1926
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents