Granted Patent
Utility
US 5,222,552 · App. 07/893,169
Tubular heat exchanger and method for bending tubes
Inventor:
Eugene H. Schuchert
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Jun 3, 1992
Inventor
Eugene H. Schuchert
Assignee (at issue)
Amana Refrigeration, 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.