Granted Patent
Utility
US 5,227,026 · App. 07/730,011
Retort heat exchanger apparatus
Inventor:
Jim S. Hogan
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jul 12, 1991
Inventor
Jim S. Hogan
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.