Granted Patent
Utility
US 4,808,938 · App. 07/120,440
Impedance-matched signal selecting and combining system
Inventor:
Samuel Levinson
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Nov 13, 1987
Inventor
Samuel Levinson
Assignee (at issue)
UNITED TECHNOLOGIES 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.