Granted Patent
Utility
US 5,965,833 · App. 09/157,761
Rotary valve for a musical instrument
Inventor:
Christian Lindberg
Patented Case
View Patent ↗
Granted: Oct 12, 1999
Filed: Sep 21, 1998
Inventor
Christian Lindberg
Assignee (at issue)
United Musical Instruments U.S.A., Inc.
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.