Richard H. Grappendorf

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Riverton, UT, US

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Patents Grantslast 30 patents

Information Patent Grant
Bit design for a rotating bit incorporating synthetic polycrystalli...
- Patent number 4,744,427
- Issue date May 17, 1988
- Eastman Christensen Company
- Richard H. Grappendorf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Earth boring bit for soft to hard formations
- Patent number 4,673,044
- Issue date Jun 16, 1987
- Eastman Christensen Co.
- Louis K. Bigelow
- E21 - EARTH DRILLING MINING
Information Patent Grant
Cutter configuration for a gage-to-shoulder transition and face pat...
- Patent number 4,586,574
- Issue date May 6, 1986
- Norton Christensen, Inc.
- Richard H. Grappendorf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tooth configuration for an earth boring bit
- Patent number 4,499,959
- Issue date Feb 19, 1985
- Christensen, Inc.
- Richard H. Grappendorf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Diamond cutting element in a rotating bit
- Patent number 4,491,188
- Issue date Jan 1, 1985
- Norton Christensen, Inc.
- Richard H. Grappendorf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit
- Patent number 4,352,400
- Issue date Oct 5, 1982
- Christensen, Inc.
- Richard H. Grappendorf
- E21 - EARTH DRILLING MINING