Granted Patent
Utility
US 4,623,921 · App. 06/739,431
Antenna diplexer utilizing aural input for visual service
Inventors:
Anthony Schmitz, Joseph J. Matta
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: May 30, 1985
Inventors
Anthony Schmitz
Joseph J. Matta
Assignee (at issue)
Federal Signal Corporation
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.