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*
|
|
1964-03-24 |
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Rotary drill bit with wiper blade |
USRE23416E
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*
|
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1951-10-16 |
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Drill |
US930759A
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*
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1908-11-20 |
1909-08-10 |
Howard R Hughes |
Drill.
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US1519641A
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*
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1920-10-12 |
1924-12-16 |
Walter N Thompson |
Rotary underreamer
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US1821474A
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*
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1927-12-05 |
1931-09-01 |
Sullivan Machinery Co |
Boring tool
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US1874066A
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*
|
1930-04-28 |
1932-08-30 |
Floyd L Scott |
Combination rolling and scraping cutter drill
|
US1932487A
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*
|
1930-07-11 |
1933-10-31 |
Hughes Tool Co |
Combination scraping and rolling cutter drill
|
US1879127A
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*
|
1930-07-21 |
1932-09-27 |
Hughes Tool Co |
Combination rolling and scraping cutter bit
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US2030722A
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*
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1933-12-01 |
1936-02-11 |
Hughes Tool Co |
Cutter assembly
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US2198849A
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*
|
1938-06-09 |
1940-04-30 |
Reuben L Waxler |
Drill
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US2216894A
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*
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1939-10-12 |
1940-10-08 |
Reed Roller Bit Co |
Rock bit
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*
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1939-12-22 |
1941-06-03 |
Archer W Kammerer |
Well drilling bit
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US2320136A
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*
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1940-09-30 |
1943-05-25 |
Archer W Kammerer |
Well drilling bit
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US2297157A
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*
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1940-11-16 |
1942-09-29 |
Mcclinton John |
Drill
|
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*
|
1941-08-12 |
1943-05-25 |
Archer W Kammerer |
Rotary drill bit
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US2380112A
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*
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1942-01-02 |
1945-07-10 |
Kinnear Clarence Wellington |
Drill
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US2719026A
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*
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1952-04-28 |
1955-09-27 |
Reed Roller Bit Co |
Earth boring drill
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*
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1956-02-29 |
1957-12-10 |
Norman E Wolfram |
Retractable rock drill bit apparatus
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US2994389A
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*
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1957-06-07 |
1961-08-01 |
Le Bus Royalty Company |
Combined drilling and reaming apparatus
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*
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1959-08-10 |
1962-12-04 |
Jersey Prod Res Co |
Combination drill bit
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US3010708A
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1960-04-11 |
1961-11-28 |
Goodman Mfg Co |
Rotary mining head and core breaker therefor
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*
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1960-05-31 |
1962-09-25 |
Jersey Prod Res Co |
Drill bit
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1963-02-21 |
1966-03-08 |
Knapp Seth Raymond |
Rotary well bits
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1963-06-10 |
1965-03-23 |
Hughes Tool Co |
Combination core bit
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1964-01-10 |
1966-08-30 |
Hughes Tool Co |
Solid head rotary-percussion bit with rolling cutters
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1966-03-15 |
1968-06-11 |
Ingersoll Rand Co |
Rotary percussion gang drill
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1966-11-16 |
1969-01-28 |
Japan Petroleum Dev Corp |
Rotary bit for use in rotary drilling
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DE1301784B
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1968-01-27 |
1969-08-28 |
Deutsche Erdoel Ag |
Kombinationsbohrmeissel fuer plastisches Gebirge
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1969-03-06 |
1971-06-08 |
Mission Mfg Co |
Rock bit with powered gauge cutter
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1970-08-03 |
1975-11-25 |
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Rock drill with increased bearing life
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1975-06-11 |
1977-02-08 |
Smith International, Inc. |
Diamond cutter rock bit with penetration limiting
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JPS5382601A
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1976-12-28 |
1978-07-21 |
Tokiwa Kogyo Kk |
Rotary grinding type excavation drill head
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1977-06-06 |
1979-02-20 |
Smith International, Inc. |
Rock bit with diamond reamer to maintain gage
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1977-07-08 |
1981-06-02 |
Thomas Robert D |
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1977-07-23 |
1981-12-23 |
Среднеазиатский Научно-Исследовательский Институт Геологии И Минерального Сырья |
Комбинированное буровое долото
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SU876947A1
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1978-06-01 |
1981-10-30 |
Кузбасский Политехнический Институт |
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1979-06-28 |
1981-08-25 |
Smith International, Inc. |
Two cone bit with extended diamond cutters
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1981-05-11 |
1985-07-09 |
Bodine Albert G |
Cycloidal drill bit
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1980-01-25 |
1981-10-06 |
Smith International, Inc. |
Jet dual bit
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1980-04-28 |
1982-08-10 |
Smith International, Inc. |
Hybrid rock bit
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1980-06-05 |
1983-01-25 |
Reed Rock Bit Company |
Large diameter oil well drilling bit
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1980-06-19 |
1982-11-16 |
Smith International, Inc. |
Hybrid diamond insert platform locator and retention method
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1980-06-24 |
1982-03-23 |
Garrett Wylie P |
Rotary drill bit
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1980-12-08 |
1983-06-07 |
Evans Robert F |
Drill bit with yielding support and force applying structure for abrasion cutting elements
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1982-04-22 |
1983-10-18 |
Smith International, Inc. |
Composite floating element thrust bearing
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1983-03-30 |
1984-04-24 |
Reed Rock Bit Company |
Combination drag and roller cutter drill bit
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1984-03-26 |
1985-10-03 |
Norton Christensen Inc. |
Cutting element using polycrystalline diamond disks
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1984-03-26 |
1991-07-02 |
Eastman Christensen Company |
Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks
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1984-03-26 |
1988-02-23 |
Eastman Christensen Co. |
Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks
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1984-12-07 |
1986-02-25 |
Dorosz Dennis D E |
Journal bushing drill bit construction
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1984-12-21 |
1988-04-19 |
Smith International Inc. |
Polycrystalline diamond bearing system for a roller cone rock bit
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1985-05-06 |
1987-04-14 |
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1987-08-23 |
И.И. Барабашкин, И. В. Воевидко и В. М. Ивасив |
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Infiltrated thermally stable polycrystalline diamond
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1985-11-23 |
1986-01-02 |
Nl Petroleum Prod |
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1986-03-14 |
1987-09-01 |
Eastman Christensen Company |
Changeover bit for extended life, varied formations and steady wear
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1986-10-20 |
1992-05-26 |
Norton Company |
Method for low pressure bonding of PCD bodies
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1986-10-20 |
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Norton Company |
Low pressure bonding of PCD bodies and method
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1986-10-20 |
1990-07-24 |
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1988-03-01 |
Hughes Tool Company |
Compensator for earth boring bits
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1987-06-01 |
1988-08-23 |
Bob Higdon |
Method of assembling drill bits and product assembled thereby
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1990-06-19 |
Jerome Labrosse |
Tubing bit opener
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1988-06-27 |
2001-11-20 |
The Charles Machine Works, Inc. |
Directional multi-blade boring head
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1988-07-06 |
1991-07-02 |
Baker Hughes Incorporated |
Drill bit having improved cutter configuration
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1988-07-21 |
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Cummins Engine Company, Inc. |
Method and apparatus for retaining roller cone of drill bit
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1988-09-19 |
1989-10-24 |
Dresser Industries, Inc. |
Roller drill bit having radial-thrust pilot bushing incorporating anti-galling material
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1988-11-29 |
1990-01-09 |
Exxon Production Research Company |
Kerf-cutting apparatus and method for improved drilling rates
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1989-01-26 |
1992-07-29 |
Geir Tandberg |
Kombinasjonsborekrone
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1989-04-05 |
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Morrison Pumps Sa |
Drilling
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1989-04-10 |
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Amoco Corporation |
Whirl resistant bit
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1989-04-27 |
1990-09-04 |
Hughes Tool Company |
Two cone bit with non-opposite cones
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1989-07-07 |
1990-06-26 |
Cledisc International B.V. |
Rotary drilling device
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1990-01-05 |
1991-09-17 |
Norton Company |
Multilayer coated abrasive element for bonding to a backing
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1990-03-13 |
1991-02-12 |
Camco International Inc. |
Means for mounting a roller cutter on a drill bit
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1990-03-21 |
1991-01-15 |
Hughes Tool Company |
Anti-balling earth boring bit
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1990-10-30 |
1993-07-06 |
Modular Engineering |
Modular drill bit
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1991-01-07 |
1992-09-08 |
Exxon Production Research Company |
Kerf-cutting apparatus for increased drilling rates
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1991-10-21 |
1999-08-24 |
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Directional boring head with blade assembly
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1992-01-06 |
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Mosaic diamond drag bit cutter having a nonuniform wear pattern
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1992-01-31 |
1994-02-22 |
Baker Hughes Incorporated |
Rolling cone bit with shear cutting gage
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1992-01-31 |
1994-09-13 |
Baker Hughes Incorporated |
Rolling cone bit with shear cutting gage
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1992-01-31 |
1995-11-21 |
Baker Hughes Incorporated |
Fixed cutter bit with shear cutting gage
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1992-02-17 |
1995-04-19 |
Kverneland Klepp As |
Anordning ved borekroner
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1992-05-15 |
1993-11-18 |
Baker Hughes Incorporated |
Improved anti-whirl drill bit
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Method and apparatus for improving drill bit stability
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Roller cone core bit with spiral stabilizers
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1993-02-12 |
1996-10-01 |
Baker Hughes Incorporated |
Bit for subterranean drilling fabricated from separately-formed major components
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1993-02-12 |
1994-11-08 |
Baker Hughes Incorporated |
Expandable gage bit for drilling and method of drilling
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1993-04-26 |
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Amerock Corporation |
Hinge for inset doors
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1994-03-31 |
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Dresser Industries, Inc. |
Rotary drill bit with improved cutter and seal protection
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1994-03-31 |
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Rotary drill bit with improved cutter
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Atlantic Richfield Company |
Drilling with casing and retrievable bit-motor assembly
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1994-08-08 |
1997-01-14 |
Dresser Ind |
Modular rotary drill bit
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Flat seal for a roller cone rock bit
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Rotary cone drill bit and method for enhanced lifting of fluids and cuttings
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1994-12-07 |
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Rotary cone drill bit with angled ramps
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Rotary cone drill bit with integral stabilizers
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Hydrodynamic bearing
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Rotary drill bit with improved shirttail and seal protection
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Rotary cone drill bit modular arm
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Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts
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Rotary cone drill bit
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Earth-boring bit with negative offset and inverted gage cutting elements
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Freitragend ausgebildeter Erweiterungsbohrer
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Thrust plugs for rotary cone air bits
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Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty
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Rock drill bit with back-reaming protection
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Gauge face inlay for bit hardfacing
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Rock bit with improved thrust face
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Impregnated drill bits with adaptive matrix
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1998-01-26 |
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Rotary cone drill bit with enhanced thrust bearing flange
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1998-01-26 |
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Improved rock drill bit with neck protection
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Side cutting gage pad improving stabilization and borehole integrity
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Drill bits with reduced exposure of cutters
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Roller cone drill bit shale diverter
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Polycrystaline diamond compact insert reaming tool
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Impregnated bit with PDC cutters in cone area
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Impregnated rotary drag bit
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掘削ヘッド
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Techniques for modeling/simulating, designing optimizing, and displaying hybrid drill bits
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Centered-leg roller cone drill bit
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Hydro-lifter rock bit with PDC inserts
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2000-09-18 |
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Solid lubricant for air cooled drill bit and method of drilling
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Polykristalliner diamant mit einer an katalysatormaterial abgereicherten oberfläche
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