Roger I. Krech

Follow

Person

St. Paul, MN, US

People

Patents Grantslast 30 patents

Information 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
Information 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