Granted Patent
Utility
US 5,094,224 · App. 07/661,493
Enhanced tubular heat exchanger
Inventor:
Mark A. Diesch
Patented Case
View Patent ↗
Granted: Mar 10, 1992
Filed: Feb 26, 1991
Inventor
Mark A. Diesch
Assignee (at issue)
Inter-City Products Corporation (USA)
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.