Granted Patent
Utility
US 5,060,722 · App. 07/610,887
Furnace heat exchanger
Inventors:
Peter E. Zdenek, James T. Vershaw
Patented Case
View Patent ↗
Granted: Oct 29, 1991
Filed: Nov 6, 1990
Inventors
Peter E. Zdenek
James T. Vershaw
Assignee (at issue)
American Standard 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.