TREA

Bernt S. Liljekvist

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  • Storvik, SE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Drill bit
    • Patent number 4,805,705
    • Issue date Feb 21, 1989
    • Santrade Limited
    • Sven P. Liljebrand
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Drill element for percussion drilling
    • Patent number 4,760,887
    • Issue date Aug 2, 1988
    • Santrade Limited
    • Kjell-Ove L. Jansson
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rock drill bit
    • Patent number 4,598,779
    • Issue date Jul 8, 1986
    • Santrade Limited
    • Bernt S. Liljekvist
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Guiding device for percussion drills
    • Patent number 4,441,565
    • Issue date Apr 10, 1984
    • Santrade Ltd.
    • Bernt S. Liljekvist
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Boring head
    • Patent number 4,399,879
    • Issue date Aug 23, 1983
    • Santrade Ltd.
    • Bernt S. Liljekvist
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method and device in earth cutting
    • Patent number 4,274,496
    • Issue date Jun 23, 1981
    • Sandvik Aktiebolag
    • Bernt S. Liljekvist
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Reamer bit for raise boring
    • Patent number 4,228,863
    • Issue date Oct 21, 1980
    • Sandvik Aktiebolag
    • Bernt S. Liljekvist
    • E21 - EARTH DRILLING MINING