John S. Roden

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White Bear Lake, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Magnetic recording media incorporating a quaternary ammonium functi...
- Patent number 6,139,946
- Issue date Oct 31, 2000
- Imation Corp.
- Joseph K. Bailey
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Hexagonal magnetic ferrite pigment for high density magnetic record...
- Patent number 5,626,956
- Issue date May 6, 1997
- Imation Corp.
- David M. Hopstock
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Hexagonal magnetic ferrite pigment for high density magnetic record...
- Patent number 5,616,414
- Issue date Apr 1, 1997
- Imation Corp.
- David M. Hopstock
- G11 - INFORMATION STORAGE
Information Patent Grant
Process of making hexagonal magnetic ferrite pigment for high densi...
- Patent number 5,378,384
- Issue date Jan 3, 1995
- Minnesota Mining and Manufacturing Company
- David M. Hopstock
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Aqueous ferrofluid
- Patent number 5,240,626
- Issue date Aug 31, 1993
- Minnesota Mining and Manufacturing Company
- Ranjit Thakur
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Metallic ferromagnetic particles for use in environmentally stable...
- Patent number 3,932,293
- Issue date Jan 13, 1976
- Minnesota Mining and Manufacturing Company
- John S. Roden
- G11 - INFORMATION STORAGE