Walter Geffcken

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Munich, DE

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Patents Grantslast 30 patents

Information Patent Grant
Flat gas discharge display
- Patent number 4,667,130
- Issue date May 19, 1987
- Siemens Aktiengesellschaft
- Walter Geffcken
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas discharge display device
- Patent number 4,628,228
- Issue date Dec 9, 1986
- Siemens Aktiengesellschaft
- Walter Geffcken
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas discharge display device with an auxiliary anode control plate
- Patent number 4,625,148
- Issue date Nov 25, 1986
- Siemens AG
- Walter Geffcken
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Flat color picture reproduction or video display device
- Patent number 4,527,100
- Issue date Jul 2, 1985
- Siemens Aktiengesellschaft
- Walter Geffcken
- H04 - ELECTRIC COMMUNICATION TECHNIQUE