Douglas K. Stephens

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Dickinson, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Precipitated silicas, silica gels with and free of deposited carbon...
- Patent number 6,638,354
- Issue date Oct 28, 2003
- Agritec, Inc.
- Douglas K. Stephens
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Fine-celled foam composition and method having improved thermal ins...
- Patent number 6,409,817
- Issue date Jun 25, 2002
- Agritec, Inc.
- Douglas K. Stephens
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Precipitated silicas, silica gels with and free of deposited carbon...
- Patent number 6,375,735
- Issue date Apr 23, 2002
- Agritec, Inc.
- Douglas K. Stephens
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Highly activated carbon from caustic digestion of rice hull ash and...
- Patent number 6,114,280
- Issue date Sep 5, 2000
- Agritec, Inc.
- Douglas K. Stephens
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method of producing activated carbon
- Patent number 5,858,911
- Issue date Jan 12, 1999
- Agritec, Inc.
- Clyde W. Wellen
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Fine-celled foam composition and method
- Patent number 5,714,000
- Issue date Feb 3, 1998
- Agritec, Inc.
- Clyde W. Wellen
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES

Patents Applicationslast 30 patents

Information Patent Application
Precipitated silicas, silica gels with and free of deposited carbon...
- Publication number 20030097966
- Publication date May 29, 2003
- Agritec, Inc.
- Douglas K. Stephens
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES