Granted Patent
Utility
US 5,012,199 · App. 07/404,595
Multi-stage musical instrument amplifier having distortion modes
Inventor:
George A. McKale
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Sep 8, 1989
Inventor
George A. McKale
Assignee (at issue)
St. Louis Music, 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.