Roland Kurzen

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St. Antoni, CH

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Patents Grantslast 30 patents

Information Patent Grant
Use of tertiary phosphines in photographic silver dye bleach materials
- Patent number 4,357,280
- Issue date Nov 2, 1982
- Ciba-Geigy AG
- Christoph Chylewski
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method of processing photographic silver dye bleach materials
- Patent number 4,138,256
- Issue date Feb 6, 1979
- Ciba-Geigy AG
- Christoph Chylewski
- C07 - ORGANIC CHEMISTRY