Granted Patent
Utility
US 4,418,893 · App. 06/331,040
Water-cooled refractory lined furnaces
Inventors:
John A. Middleton, Thomas L. O'Dwyer
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Dec 16, 1981
Inventors
John A. Middleton
Thomas L. O'Dwyer
Assignee (at issue)
Combustion Engineering, 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.