Granted Patent
Utility
US 6,420,944 · App. 09/508,815
Antenna duplexer in waveguide, with no tuning bends
Inventors:
Mario Costa, Roberto Ravanelli
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Apr 7, 2000
Inventors
Mario Costa
Roberto Ravanelli
Assignee (at issue)
Siemens Information and Communication Networks, Inc.
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.