Granted Patent
Utility
US 4,447,233 · App. 06/403,679
Medication infusion pump
Inventor:
William B. Mayfield
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Jul 30, 1982
Inventor
William B. Mayfield
Assignee (at issue)
Parker-Hannifin Corporation
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.