Granted Patent
Utility
US 4,865,013 · App. 07/276,346
Self-adjusting telescoping concentric flue assembly
Inventor:
Keith Teakell
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Nov 25, 1988
Inventor
Keith Teakell
Assignee (at issue)
Nordyne LLC
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.