Helmut Grottrup

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Munich, DE

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Patents Grantslast 30 patents

Information Patent Grant
Circuit unit
- Patent number 4,841,128
- Issue date Jun 20, 1989
- Gesellschaft fur Automation u. Organization mbH
- Helmut Grottrup
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for card authentication using display of symbo...
- Patent number 4,291,222
- Issue date Sep 22, 1981
- GAO Gesellschaft fur Automation und Organisation mbH
- Helmut Grottrup
- G07 - CHECKING-DEVICES
Information Patent Grant
Safeguard against falsification of securities and the like which is...
- Patent number 4,157,784
- Issue date Jun 12, 1979
- G.A.O. Gesellschaft fur Automation und Organisation mbH
- Helmut Grottrup
- G06 - COMPUTING CALCULATING COUNTING