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1973-05-24 |
1978-01-24 |
Kennametal Inc. |
Excavation tool
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1974-07-01 |
1975-11-11 |
Hughes Tool Co |
Rotary percussion earth boring bit
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1975-04-28 |
1976-07-20 |
Hughes Tool Company |
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1976-06-01 |
1977-09-13 |
Dresser Industries, Inc. |
Earth boring cutting element retention system
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1975-12-15 |
1977-02-01 |
Kennametal Inc. |
Impact or demolition tool
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1976-06-29 |
1978-03-07 |
Kennametal Inc. |
Insert for mining tools and the like
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1977-03-03 |
1980-02-11 |
Sandvik Ab |
Borrkrona for bergborrning
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1978-10-02 |
1982-06-08 |
General Electric Company |
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1979-05-02 |
1982-04-20 |
Smith International, Inc. |
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1981-03-31 |
1983-09-27 |
Hughes Tool Company |
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1981-04-24 |
1982-10-29 |
Vennin Henri |
Outil de forage monobloc rotatif comportant des elements de coupe diamantes et des buses
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1984-04-02 |
1988-04-26 |
Becker Drills, Inc. |
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1984-07-19 |
1984-08-22 |
Nl Petroleum Prod |
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1984-07-19 |
1991-02-12 |
Reed Tool Company, Ltd. |
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1985-12-02 |
1987-04-07 |
W. Wesley Perry |
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1985-12-02 |
1987-04-07 |
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1992-07-21 |
Kennametal Inc. |
Insert having a surface of carbide particles
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1991-01-19 |
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Wolf Thomas |
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1992-01-31 |
1995-11-21 |
Baker Hughes Incorporated |
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1992-01-31 |
1994-02-22 |
Baker Hughes Incorporated |
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1992-01-31 |
1994-09-13 |
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1994-09-07 |
2003-04-15 |
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1994-09-07 |
1997-04-01 |
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1996-01-22 |
1998-01-20 |
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2004-05-25 |
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1999-01-25 |
2001-07-17 |
Baker Hughes Incorporated |
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2005-03-11 |
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