Changchun Zhang

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Columbus, IN, US

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Patents Grantslast 30 patents

Information Patent Grant
Geothermal heat exchanger
- Patent number 8,511,368
- Issue date Aug 20, 2013
- James Hardin
- F24 - HEATING RANGES VENTILATING

Patents Applicationslast 30 patents

Information Patent Application
GEOTHERMAL HEAT EXCHANGER
- Publication number 20080289795
- Publication date Nov 27, 2008
- James Hardin
- F24 - HEATING RANGES VENTILATING