Granted Patent
Utility
US 4,628,869 · App. 06/697,173
Variable temperature waste heat recovery system
Inventors:
Dale R. Symsek, Nancy P. Regelin
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Feb 1, 1985
Inventors
Dale R. Symsek
Nancy P. Regelin
Assignee (at issue)
United States Steel 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.