John D. Barr

Person

Gloucestershire, GB

People

Patents Grantslast 30 patents

Information Patent Grant
Measurement of curvature of a subsurface borehole, and use of such...
- Patent number 6,877,241
- Issue date Apr 12, 2005
- Schlumberger Technology Corporation
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Steerable rotary drilling systems
- Patent number 6,089,332
- Issue date Jul 18, 2000
- Camco International (UK) Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Steerable rotary drilling systems and method of operating such systems
- Patent number 5,803,185
- Issue date Sep 8, 1998
- Camco Drilling Group Limited of Hycalog
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Steerable rotary drilling systems
- Patent number 5,706,905
- Issue date Jan 13, 1998
- Camco Drilling Group Limited, of Hycalog
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
System and method of controlling rotation of a downhole instrument...
- Patent number 5,695,015
- Issue date Dec 9, 1997
- Camco Drilling Group Ltd. of Hycalog
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of operating a steerable rotary drilling system
- Patent number 5,685,379
- Issue date Nov 11, 1997
- Camco Drilling Group Ltd. of Hycalog
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Modulated bias unit for rotary drilling
- Patent number 5,582,259
- Issue date Dec 10, 1996
- Camco Drilling Group Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Modulated bias units for steerable rotary drilling systems
- Patent number 5,553,678
- Issue date Sep 10, 1996
- Camco International Inc.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Modulated bias unit for rotary drilling
- Patent number 5,520,255
- Issue date May 28, 1996
- Camco Drilling Group Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Steerable rotary drilling systems
- Patent number 5,265,682
- Issue date Nov 30, 1993
- Camco Drilling Group Limited
- Michael K. Russell
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rotary drills bits
- Patent number 5,165,494
- Issue date Nov 24, 1992
- Camco Drilling Group Ltd.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Methods of manufacturing cutter assemblies for rotary drill bits
- Patent number 5,101,691
- Issue date Apr 7, 1992
- Reed Tool Company Limited
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Cutting elements for rotary drill bits
- Patent number 5,061,293
- Issue date Oct 29, 1991
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Cutting elements for rotary drill bits
- Patent number 5,025,874
- Issue date Jun 25, 1991
- Reed Tool Company Ltd.
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Cutting elements for rotary drill bits
- Patent number 4,995,887
- Issue date Feb 26, 1991
- Reed Tool Company Limited
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Relating to rotary drill bits
- Patent number 4,942,933
- Issue date Jul 24, 1990
- Reed Tool Company, Ltd.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Cutting structures for rotary drill bits
- Patent number 4,898,252
- Issue date Feb 6, 1990
- Reed Tool Company Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Manufacture of rotary drill bits
- Patent number 4,878,403
- Issue date Nov 7, 1989
- Reed Tool Company Limited
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Manufacture of rotary drill bits
- Patent number 4,873,895
- Issue date Oct 17, 1989
- Reed Tool Company Limited
- Malcolm R. Taylor
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Drill bit and cutter therefor
- Patent number 4,862,977
- Issue date Sep 5, 1989
- Reed Tool Company, Ltd.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rotary drill bits
- Patent number 4,804,049
- Issue date Feb 14, 1989
- NL Petroleum Products Limited
- John D. Barr
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Manufacture of rotary drill bits
- Patent number 4,780,274
- Issue date Oct 25, 1988
- Reed Tool Company, Ltd.
- John D. Barr
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Rotary drill bits
- Patent number 4,733,735
- Issue date Mar 29, 1988
- NL Petroleum Products Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rotary drill bits
- Patent number 4,727,946
- Issue date Mar 1, 1988
- NL Industries, Inc.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit and method of manufacture
- Patent number 4,711,144
- Issue date Dec 8, 1987
- NL Industries, Inc.
- John D. Barr
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Rotary drill bits
- Patent number 4,697,654
- Issue date Oct 6, 1987
- NL Petroleum Products Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rotary drill bits with nozzle former and method of manufacturing
- Patent number 4,694,919
- Issue date Sep 22, 1987
- NL Petroleum Products Limited
- John D. Barr
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Rotary drill bits and cutting elements for such bits
- Patent number 4,679,639
- Issue date Jul 14, 1987
- NL Petroleum Products Limited
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit and cutter therefor
- Patent number 4,676,324
- Issue date Jun 30, 1987
- NL Industries, Inc.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit and cutter therefor
- Patent number 4,669,556
- Issue date Jun 2, 1987
- NL Industries, Inc.
- John D. Barr
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Measurement of curvature of a subsurface borehole, and use of such...
- Publication number 20030037963
- Publication date Feb 27, 2003
- John D. Barr
- E21 - EARTH DRILLING MINING

John D. Barr

Person

Patents Grantslast 30 patents

Measurement of curvature of a subsurface borehole, and use of such...

Steerable rotary drilling systems

Steerable rotary drilling systems and method of operating such systems

Steerable rotary drilling systems

System and method of controlling rotation of a downhole instrument...

Method of operating a steerable rotary drilling system

Modulated bias unit for rotary drilling

Modulated bias units for steerable rotary drilling systems

Modulated bias unit for rotary drilling

Steerable rotary drilling systems

Rotary drills bits

Methods of manufacturing cutter assemblies for rotary drill bits

Cutting elements for rotary drill bits

Cutting elements for rotary drill bits

Cutting elements for rotary drill bits

Relating to rotary drill bits

Cutting structures for rotary drill bits

Manufacture of rotary drill bits

Manufacture of rotary drill bits

Drill bit and cutter therefor

Rotary drill bits

Manufacture of rotary drill bits

Rotary drill bits

Rotary drill bits

Drill bit and method of manufacture

Rotary drill bits

Rotary drill bits with nozzle former and method of manufacturing

Rotary drill bits and cutting elements for such bits

Drill bit and cutter therefor

Drill bit and cutter therefor

Patents Applicationslast 30 patents

Measurement of curvature of a subsurface borehole, and use of such...