Granted Patent
Utility
US 4,837,836 · App. 06/430,749
Microphone pickup system
Inventor:
Lester M. Barcus
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Sep 30, 1982
Inventor
Lester M. Barcus
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.