Hans Keller

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Kiel, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method and circuit arrangement for selective correction of hues and...
- Patent number 4,649,423
- Issue date Mar 10, 1987
- Dr. Ing. Rudolf Hell GmbH
- Ingo Hoffrichter
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Production of printing blocks or forms
- Patent number 4,293,872
- Issue date Oct 6, 1981
- Dr.-Ing. Rudolf Hell GmbH
- Hans Keller
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Apparatus and process for color-identification
- Patent number 4,110,826
- Issue date Aug 29, 1978
- Dr. -Ing. Rudolf Hell GmbH.
- Klaus Mollgaard
- G01 - MEASURING TESTING