Granted Patent
Utility
US 4,481,935 · App. 06/449,879
Flue pipe connection
Inventor:
Fred Bawel
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Dec 15, 1982
Inventor
Fred Bawel
Assignee (at issue)
Arkla Industries, 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.