Hans Hildebrand

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Baar, CH

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Patents Grantslast 30 patents

Information Patent Grant
Soil heat exchanger
- Patent number 5,937,934
- Issue date Aug 17, 1999
- Geohil AG
- Hans Hildebrand
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Arrangement for effecting an energy exchange between earth soil and...
- Patent number 5,738,164
- Issue date Apr 14, 1998
- Geohil AG
- Hans Hildebrand
- F24 - HEATING RANGES VENTILATING