Granted Patent
Utility
US 4,660,004 · App. 06/732,161
Duplexer including integral interdigital transmitter and receiver filters and three-quarter wavelength antenna transformer section
Inventor:
Ronald E. Jachowski
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: May 8, 1985
Inventor
Ronald E. Jachowski
Assignee (at issue)
Orion Industries, Ltd.
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.