Granted Patent
Utility
US 6,720,840 · App. 10/218,590
Polarization rotationer
Inventor:
Gerd Bohnet
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Aug 15, 2002
Inventor
Gerd Bohnet
Assignee (at issue)
Radio Frequency Systems 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.