Granted Patent
Utility
US 6,198,567 · App. 09/186,840
Faraday rotation variable attenuator
Inventor:
Ernest Eisenhardt Bergmann
Patented Case
View Patent ↗
Granted: Mar 6, 2001
Filed: Nov 5, 1998
Inventor
Ernest Eisenhardt Bergmann
Assignee (at issue)
LUCENT TECHNOLOGIES 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.