TREA

Devices for withdrawing props or chocks

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Industry

  • CPC
  • E21D15/60
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D15/00Props Chocks

Current Industry

E21D15/60Devices for withdrawing props or chocks
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Base mechanism of single prop capable of being unloaded at reduced...
    • Patent number 10,895,154
    • Issue date Jan 19, 2021
    • China University of Mining and Technology
    • Qiang Zhang
    • A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
  • Information Patent Grant

    Mechanical constant-resistance single prop continuous prop lifting...
    • Patent number 10,844,717
    • Issue date Nov 24, 2020
    • China University of Mining and Technology
    • Yanlong Chen
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Process method for withdrawing and recovering mechanical constant-r...
    • Patent number 10,352,167
    • Issue date Jul 16, 2019
    • China University of Mining and Technology
    • Jixiong Zhang
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method for removing hydraulic support for solid filling coal mining
    • Patent number 10,036,252
    • Issue date Jul 31, 2018
    • China University of Mining and Technology
    • Feng Ju
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3295814
    • Patent number 3,295,814
    • Issue date Jan 3, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3191506
    • Patent number 3,191,506
    • Issue date Jun 29, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3136534
    • Patent number 3,136,534
    • Issue date Jun 9, 1964
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3077741
    • Patent number 3,077,741
    • Issue date Feb 19, 1963
    • 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

    2997272
    • Patent number 2,997,272
    • Issue date Aug 22, 1961
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2904301
    • Patent number 2,904,301
    • Issue date Sep 15, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2816728
    • Patent number 2,816,728
    • Issue date Dec 17, 1957
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2723100
    • Patent number 2,723,100
    • Issue date Nov 8, 1955
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2677535
    • Patent number 2,677,535
    • Issue date May 4, 1954
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2647736
    • Patent number 2,647,736
    • Issue date Aug 4, 1953
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2621631
    • Patent number 2,621,631
    • Issue date Dec 16, 1952
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2606745
    • Patent number 2,606,745
    • Issue date Aug 12, 1952
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2597807
    • Patent number 2,597,807
    • Issue date May 20, 1952
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2498060
    • Patent number 2,498,060
    • Issue date Feb 21, 1950
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2430962
    • Patent number 2,430,962
    • Issue date Nov 18, 1947
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2301489
    • Patent number 2,301,489
    • Issue date Nov 10, 1942
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2190556
    • Patent number 2,190,556
    • Issue date Feb 13, 1940
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2149889
    • Patent number 2,149,889
    • Issue date Mar 7, 1939
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2068491
    • Patent number 2,068,491
    • Issue date Jan 19, 1937
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2047537
    • Patent number 2,047,537
    • Issue date Jul 14, 1936
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1924477
    • Patent number 1,924,477
    • Issue date Aug 29, 1933
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    1858954
    • Patent number 1,858,954
    • Issue date May 17, 1932
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1805381
    • Patent number 1,805,381
    • Issue date May 12, 1931
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1774308
    • Patent number 1,774,308
    • Issue date Aug 26, 1930
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    1752101
    • Patent number 1,752,101
    • Issue date Mar 25, 1930
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents