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Details of the ends of props

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  • CPC
  • E21D15/54
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Parent Industries

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

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E21D15/54Details of the ends of props
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Patents Grantslast 30 patents

  • Information Patent Grant

    Apparatus and method for pre-loading mechanical constant-resistance...
    • Patent number 10,385,692
    • Issue date Aug 20, 2019
    • China University of Mining and Technology
    • Jixiong Zhang
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    Quick-release pit prop
    • Patent number 5,967,702
    • Issue date Oct 19, 1999
    • Harmen Reinaldus Vogelzang
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Yieldable mine post having a double ball and socket configuration
    • Patent number 5,538,364
    • Issue date Jul 23, 1996
    • Steven D. Huntsman
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Ball-and-socket type connections for use with mining apparatus
    • Patent number 4,004,771
    • Issue date Jan 25, 1977
    • Gewerkschaft Eisenhutte Westfalia
    • Lubomir Plevak
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Prop-and-shoe assemblies of self-advancing mine roof-supports
    • Patent number 3,985,328
    • Issue date Oct 12, 1976
    • Hermann Hemscheidt Maschinenfabrik
    • Hans Bull
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3782673
    • Patent number 3,782,673
    • Issue date Jan 1, 1974
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3722846
    • Patent number 3,722,846
    • Issue date Mar 27, 1973
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3689017
    • Patent number 3,689,017
    • Issue date Sep 5, 1972
    • E04 - BUILDING
  • Information Patent Grant

    3576307
    • Patent number 3,576,307
    • Issue date Apr 27, 1971
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3535071
    • Patent number 3,535,071
    • Issue date Oct 20, 1970
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3481573
    • Patent number 3,481,573
    • Issue date Dec 2, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3414227
    • Patent number 3,414,227
    • Issue date Dec 3, 1968
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3323771
    • Patent number 3,323,771
    • Issue date Jun 6, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3309054
    • Patent number 3,309,054
    • Issue date Mar 14, 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

    3269686
    • Patent number 3,269,686
    • Issue date Aug 30, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3250507
    • Patent number 3,250,507
    • Issue date May 10, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3188041
    • Patent number 3,188,041
    • Issue date Jun 8, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3184206
    • Patent number 3,184,206
    • Issue date May 18, 1965
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2987290
    • Patent number 2,987,290
    • Issue date Jun 6, 1961
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2911181
    • Patent number 2,911,181
    • Issue date Nov 3, 1959
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2723104
    • Patent number 2,723,104
    • Issue date Nov 8, 1955
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2556417
    • Patent number 2,556,417
    • Issue date Jun 12, 1951
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2537863
    • Patent number 2,537,863
    • Issue date Jan 9, 1951
    • E04 - BUILDING
  • Information Patent Grant

    2532168
    • Patent number 2,532,168
    • Issue date Nov 28, 1950
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2455664
    • Patent number 2,455,664
    • Issue date Dec 7, 1948
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    2377530
    • Patent number 2,377,530
    • Issue date Jun 5, 1945
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2221843
    • Patent number 2,221,843
    • Issue date Nov 19, 1940
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2221203
    • Patent number 2,221,203
    • Issue date Nov 12, 1940
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    2093284
    • Patent number 2,093,284
    • Issue date Sep 14, 1937
    • B66 - HOISTING LIFTING HAULING

Patents Applicationslast 30 patents