Granted Patent
Utility
US 6,662,758 · App. 10/385,090
Condensing gas boiler for recollecting condensed latent heat using uptrend combustion
Inventor:
Youn-cheol Shin
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Mar 10, 2003
Inventor
Youn-cheol Shin
Assignee (at issue)
KYUNG DONG BOILER CO. LTD.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.