Granted Patent
Utility
US 4,611,622 · App. 06/670,261
Drain for condensate from flue gas
Inventor:
Hongsik Ahn
Patented Case
View Patent ↗
Granted: Sep 16, 1986
Filed: Nov 13, 1984
Inventor
Hongsik Ahn
Assignee (at issue)
Intertherm Inc.
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.