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Gunther H. Dierssen
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White Bear Lake, MN, US
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last 30 patents
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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
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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
Granular silicon carbide abrasive grain coated with refractory mate...
Patent number
4,505,720
Issue date
Mar 19, 1985
Minnesota Mining and Manufacturing Company
Thomas Gabor
B24 - GRINDING POLISHING