TREA

Hydraulically operated extension devices

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Industry

  • CPC
  • E21D17/0206
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D17/00Caps for supporting mine roofs

Current Industry

E21D17/0206Hydraulically operated extension devices
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3902325
    • Patent number 3,902,325
    • Issue date Sep 2, 1975
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3686874
    • Patent number 3,686,874
    • Issue date Aug 29, 1972
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3640574
    • Patent number 3,640,574
    • Issue date Feb 8, 1972
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3534559
    • Patent number 3,534,559
    • Issue date Oct 20, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3512364
    • Patent number 3,512,364
    • Issue date May 19, 1970
    • 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

    3441317
    • Patent number 3,441,317
    • Issue date Apr 29, 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

    3392532
    • Patent number 3,392,532
    • Issue date Jul 16, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3383868
    • Patent number 3,383,868
    • Issue date May 21, 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

    3376707
    • Patent number 3,376,707
    • Issue date Apr 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

    3320751
    • Patent number 3,320,751
    • Issue date May 23, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3312071
    • Patent number 3,312,071
    • Issue date Apr 4, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3240021
    • Patent number 3,240,021
    • Issue date Mar 15, 1966
    • 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

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

    2887191
    • Patent number 2,887,191
    • Issue date May 19, 1959
    • E04 - BUILDING
  • Information Patent Grant

    2716025
    • Patent number 2,716,025
    • Issue date Aug 23, 1955
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2700483
    • Patent number 2,700,483
    • Issue date Jan 25, 1955
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2373773
    • Patent number 2,373,773
    • Issue date Apr 17, 1945
    • B64 - AIRCRAFT AVIATION COSMONAUTICS
  • Information Patent Grant

    2263352
    • Patent number 2,263,352
    • Issue date Nov 18, 1941
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2163982
    • Patent number 2,163,982
    • Issue date Jun 27, 1939
    • B64 - AIRCRAFT AVIATION COSMONAUTICS
  • Information Patent Grant

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

    1480733
    • Patent number 1,480,733
    • Issue date Jan 15, 1924
    • E21 - EARTH DRILLING MINING