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Roger I. Krech
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St. Paul, MN, US
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last 30 patents
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Patent Grant
Color proofing element and process for making the same
Patent number
5,342,720
Issue date
Aug 30, 1994
Minnesota Mining and Manufacturing Company
Gregory L. Zwadlo
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Bilayer topcoats for organic photoconductive elements
Patent number
5,124,220
Issue date
Jun 23, 1992
Minnesota Mining and Manufacturing Company
David E. Brown
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Offset transfer of toner images in electrography
Patent number
5,108,865
Issue date
Apr 28, 1992
Minnesota Mining and Manufacturing Company
Gregory E. Zwaldo
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Patent Grant
Single sheet color proofing system
Patent number
4,260,673
Issue date
Apr 7, 1981
Minnesota Mining and Manufacturing Company
Roger I. Krech
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY