Granted Patent
Utility
US 4,656,004 · App. 06/735,332
Medical heat exchange
Inventor:
Rodger L. Stewart
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: May 17, 1985
Inventor
Rodger L. Stewart
Assignee (at issue)
Cobe Laboratories, 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.