Granted Patent
Utility
US 5,014,587 · App. 07/421,775
Electronic piano tone circuit
Inventor:
William R. Taylor
Patented Case
View Patent ↗
Granted: May 14, 1991
Filed: Oct 16, 1989
Inventor
William R. Taylor
Assignee (at issue)
The Quaker Oats 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.