Granted Patent
Utility
US 4,407,669 · App. 06/368,597
Waste heat recovery from regenerative furnaces
Inventor:
Frederick J. Nelson
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Apr 15, 1982
Inventor
Frederick J. Nelson
Assignee (at issue)
Owens-Illinois 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.