Granted Patent
Utility
US 4,957,029 · App. 07/314,068
Action for a wind instrument
Inventor:
Matti Kahonen
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Mar 1, 1989
Inventor
Matti Kahonen
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.