Granted Patent
Utility
US 4,458,021 · App. 06/373,938
Blood gas control
Inventor:
Kathryn D. Herring
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: May 3, 1982
Inventor
Kathryn D. Herring
Assignee (at issue)
American Hospital Supply Corp.
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.