US Patent D639919 Round flame heater
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Patent Inventor Names
Zhenyan Yu0
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US Patent D0639919 Round flame heater US Patent D639919 Round flame heater
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Patent Number
D0639919
Patent Number
D639919
Edits on 7 Dec, 2021
Golden AI
Edits made to:
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US Patent D0639919 Round flame heater
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Is a
Patent jurisdiction
Patent number
D0639919
Date of patent
June 14, 2011
Patent application number
29369938
Date Filed
September 15, 2010
Patent primary examiner
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