TREA

by petrification

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Industry

  • CPC
  • E21D1/16
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Parent Industries

EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D1/00Sinking shafts

Current Industry

E21D1/16by petrification
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    3698196
    • Patent number 3,698,196
    • Issue date Oct 17, 1972
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3424248
    • Patent number 3,424,248
    • Issue date Jan 28, 1969
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3326004
    • Patent number 3,326,004
    • Issue date Jun 20, 1967
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3236004
    • Patent number 3,236,004
    • Issue date Feb 22, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3234742
    • Patent number 3,234,742
    • Issue date Feb 15, 1966
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    3221505
    • Patent number 3,221,505
    • Issue date Dec 7, 1965
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    3054455
    • Patent number 3,054,455
    • Issue date Sep 18, 1962
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2232898
    • Patent number 2,232,898
    • Issue date Feb 25, 1941
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    2179077
    • Patent number 2,179,077
    • Issue date Nov 7, 1939
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    2081541
    • Patent number 2,081,541
    • Issue date May 25, 1937
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1715592
    • Patent number 1,715,592
    • Issue date Jun 4, 1929
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1635500
    • Patent number 1,635,500
    • Issue date Jul 12, 1927
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    1563200
    • Patent number 1,563,200
    • Issue date Nov 24, 1925
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1430306
    • Patent number 1,430,306
    • Issue date Sep 26, 1922
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    1394718
    • Patent number 1,394,718
    • Issue date Oct 25, 1921
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    1327268
    • Patent number 1,327,268
    • Issue date Jan 6, 1920
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    1327269
    • Patent number 1,327,269
    • Issue date Jan 6, 1920
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    363419
    • Patent number 363,419
    • Issue date May 24, 1887
    • E21 - EARTH DRILLING MINING