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Jianhan Yu
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Boulder, CO, US
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last 30 patents
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Patent Grant
Portable heat source
Patent number
6,248,257
Issue date
Jun 19, 2001
TDA Research, Inc.
William L. Bell
F24 - HEATING RANGES VENTILATING
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Patent Grant
Portable heat source
Patent number
5,935,486
Issue date
Aug 10, 1999
TDA Research, Inc.
William L. Bell
F24 - HEATING RANGES VENTILATING