Granted Patent
Utility
US 4,237,341 · App. 05/945,640
Portable self-contained amplifier and loudspeaker apparatus
Inventor:
Paul E. Richards
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Sep 25, 1978
Inventor
Paul E. Richards
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.