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Hans Koellner
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Santa Barbara, CA, US
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last 30 patents
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Patent Grant
Food warning device containing a rechargeable phase change material
Patent number
6,108,489
Issue date
Aug 22, 2000
Phase Change Laboratories, Inc.
Sigurd Frohlich
F28 - HEAT EXCHANGE IN GENERAL
Information
Patent Grant
Rechargeable phase change material unit and food warming device
Patent number
5,884,006
Issue date
Mar 16, 1999
Sigurd Frohlich
F28 - HEAT EXCHANGE IN GENERAL
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Patent Grant
Ropeway safety monitoring system
Patent number
5,528,219
Issue date
Jun 18, 1996
Konrad Doppelmayr & Sohn
Sigurd Frohlich
B61 - RAILWAYS