Granted Patent
Utility
US 4,390,013 · App. 06/220,274
Percussor assembly
Inventor:
Victor L. Bartholomew
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Dec 29, 1980
Inventor
Victor L. Bartholomew
Assignee (at issue)
Hudson Oxygen Therapy Sales Company
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.