Siegfried Dzwonnek

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Pulheim, DE

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Patents Grantslast 30 patents

Information Patent Grant
Color photographic print material
- Patent number 6,534,254
- Issue date Mar 18, 2003
- Agfa-Gevaert
- Günter Helling
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Color photographic recording material
- Patent number 6,015,654
- Issue date Jan 18, 2000
- AGFA-GEVAERT N.V.
- Jorg Hagemann
- C07 - ORGANIC CHEMISTRY