Ralf Krempel

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Inventor Addresses

AddressDuration
2400 Pacific Ave., San Francisco, CA 94115Mar 27, 84 - Nov 12, 85

Technology Profile

Technology # of Patents
G09B: EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS 2

Patents / Publication

Patents / Publication #Year of Publication / IssuedTitleCitations
4,552,5341985Visual communication system devices4
4,439,1601984Visual communication system3

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