Llewellan Anderson

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Renton, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Drill pipe having concave wrenching recesses
- Patent number 5,664,606
- Issue date Sep 9, 1997
- Atlas Copco Robbins Inc.
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Inflatable gripper assembly for rock boring machine
- Patent number 5,649,745
- Issue date Jul 22, 1997
- Atlas Copco Robbins Inc.
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Cutter assembly having a plurality of independently rotatable cutti...
- Patent number 5,598,895
- Issue date Feb 4, 1997
- Atlas Copco Robbins Inc.
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Down reaming apparatus having hydraulically controlled stabilizer
- Patent number 5,429,198
- Issue date Jul 4, 1995
- The Robbins Company
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drive head assembly for drilling machine
- Patent number 5,370,194
- Issue date Dec 6, 1994
- The Robbins Company
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Down reaming apparatus
- Patent number 5,325,932
- Issue date Jul 5, 1994
- The Robbins Company
- Llewellan Anderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock boring machine drive head with up and down drilling capability
- Patent number 5,012,878
- Issue date May 7, 1991
- The Robbins Company
- Llewellan Anderson
- E21 - EARTH DRILLING MINING