Granted Patent
Utility
US 4,416,270 · App. 06/207,468
Percussor
Inventor:
Harold R. Havstad
Patented Case
View Patent ↗
Granted: Nov 22, 1983
Filed: Nov 17, 1980
Inventor
Harold R. Havstad
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.