Granted Patent
Utility
US 4,566,441 · App. 06/602,146
Percussor subassembly for generating gas bursts
Inventor:
Harold R. Havstad
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Apr 19, 1984
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.