Helmut Keller

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Reutlingen, DT

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Patents Grantslast 30 patents

Information Patent Grant
Cyclically operating transistorized power switching circuit system
- Patent number 4,054,828
- Issue date Oct 18, 1977
- Robert Bosch GmbH
- Gerhard Conzelmann
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Luminescent voltage indicator circuit
- Patent number 3,987,392
- Issue date Oct 19, 1976
- Robert Bosch GmbH
- Adolf Kugelmann
- G01 - MEASURING TESTING
Information Patent Grant
Method and apparatus for selective burnout trimming of integrated c...
- Patent number 3,930,304
- Issue date Jan 6, 1976
- Robert Bosch GmbH
- Helmut Keller
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...