Granted Patent
Utility
US 5,266,735 · App. 07/985,250
Music training instrument and method
Inventors:
John Richard Shaffer, Craig Bradley
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Dec 2, 1992
Inventors
John Richard Shaffer
Craig Bradley
Assignee (at issue)
John Richard Shaffer
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.