Granted Patent
Utility
US 4,640,820 · App. 06/546,493
Flow-through housing with blood gas sensors
Inventor:
Robert P. Cooper
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Oct 28, 1983
Inventor
Robert P. Cooper
Assignee (at issue)
Cardiovascular Devices, 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.