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1964-03-24 |
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1948-04-05 |
1950-06-06 |
Cooper Jeremiah |
Core barrel coupling
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1953-08-14 |
1958-04-08 |
Longyear E J Co |
Wire line core barrel
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1960-11-07 |
1963-06-04 |
Christensen Diamond Prod Co |
Rubber sleeve core barrel apparatus
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1961-02-17 |
1965-12-28 |
Joy Mfg Co |
Core barrel assembly
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1961-06-08 |
1963-09-17 |
Longyear E J Co |
Wire line core barrel
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1961-11-15 |
1963-12-24 |
Cicero C Brown |
Shifting tool for well apparatus
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1965-03-31 |
1967-10-10 |
Odgers Drilling Inc |
Retractable wire line core barrel
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1965-08-19 |
1968-01-16 |
John J. Jensen |
Core barrel inner tube
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1968-04-30 |
1969-08-19 |
Longyear Co E J |
Wire line core barrel apparatus
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1968-05-31 |
1970-02-10 |
Schlumberger Technology Corp |
Well bore apparatus
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1969-03-18 |
1970-12-01 |
Boyles Bros Drilling Co |
Core barrel retrieval
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1969-04-24 |
1972-06-06 |
Honore Joseph Lambot |
Cable-type coring apparatus for retrieving underground specimens
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1973-10-04 |
1976-08-31 |
Federal Drilling Supplies Limited |
Wire line core barrel assembly
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1980-11-21 |
1985-04-25 |
Diamant Boart Sa |
Method for recovering a retrievable core receiver in upward drilling and a recovery head for this purpose
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1982-03-19 |
1984-08-21 |
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Wireline core barrel
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1985-06-05 |
1987-05-12 |
Vish Minno-Geolojki Institute |
Fixing mechanism for a wireline core barrel of core drilling equipment
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1987-05-13 |
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Diamant Boart Sa |
Device control lock core survey.
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1987-11-24 |
1989-01-31 |
Longyear Company |
Fast descent core barrel apparatus
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1988-04-22 |
1989-04-25 |
Baker Hughes Incorporated |
Downhole locking apparatus
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1988-04-25 |
1989-05-30 |
Longyear Company |
Positive latch wire line core barrel apparatus
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1989-02-22 |
1992-10-08 |
Longyear Tm Inc |
Wire line core drilling apparatus
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1989-04-25 |
1990-06-05 |
Diamant Boart-Stratabit (Usa) Inc. |
Coring tool
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1991-05-01 |
1993-12-07 |
Longyear Company |
Drilling latch apparatus
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2004-05-11 |
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1993-06-16 |
2000-03-08 |
Down Hole Technologies Pty. Ltd. |
Tool for use in system for in situ replacement of cutting means for a ground drill
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1995-08-28 |
1995-09-21 |
Down Hole Technologies Pty Ltd |
Retraction system for a latching mechanism of the tool
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1995-09-21 |
Down Hole Technologies Pty Ltd |
Locking system
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1998-09-01 |
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Core drilling latch assembly
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1998-09-04 |
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Jointed spearhead assembly
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Apparatus and system to allow tool passage ahead of a bit
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2010-10-06 |
2011-09-06 |
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Core barrel head assembly with axial groove
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