Granted Patent
Utility
US 5,526,439 · App. 08/367,379
Optical filter using electro-optic material
Inventor:
Ernest Eisenhardt Bergmann
Patented Case
View Patent ↗
Granted: Jun 11, 1996
Filed: Dec 30, 1994
Inventor
Ernest Eisenhardt Bergmann
Assignee (at issue)
AT&T CORP.
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.