David H. Duncan

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Mandan, ND, US

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Patents Grantslast 30 patents

Information Patent Grant
Neutral oil removal from natural cresylic acid mixtures
- Patent number 5,964,987
- Issue date Oct 12, 1999
- Dakota Gasification Company
- David H. Duncan
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for purifying natural cresylic acid mixtures
- Patent number 5,750,009
- Issue date May 12, 1998
- Dakota Gasification Company
- David H. Duncan
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for separating and purifying catechol mixtures
- Patent number 5,679,223
- Issue date Oct 21, 1997
- Dakota Gasification Company
- David H. Duncan
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Natural cresylic acid processing
- Patent number 5,354,429
- Issue date Oct 11, 1994
- Dakota Gasification Company
- David H. Duncan
- C07 - ORGANIC CHEMISTRY