TREA

Akinori Ota

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  • Chiyoda-ku, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Downhole percussion drills
    • Patent number 6,752,222
    • Issue date Jun 22, 2004
    • National Institute of Advanced Industrial Science and Technology
    • Hirokazu Karasawa
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    Downhole percussion drills
    • Publication number 20030111240
    • Publication date Jun 19, 2003
    • National Institute of Advanced Industrial
    • Hirokazu Karasawa
    • E21 - EARTH DRILLING MINING