Granted Patent
Utility
US 4,730,600 · App. 06/331,167
Condensing furnace
Inventor:
William T. Harrigill
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Dec 16, 1981
Inventor
William T. Harrigill
Assignee (at issue)
The Coleman Company, 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.