Granted Patent
Utility
US 4,577,615 · App. 06/685,711
Heat pipe central furnace
Inventor:
Ronald S. Tomlinson
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Dec 24, 1984
Inventor
Ronald S. Tomlinson
Assignee (at issue)
Heil-Quaker Corporation
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.