Granted Patent
Utility
US 4,286,839 · App. 06/102,767
Light directing control system, particularly for medical operating and diagnostic use
Inventors:
Karl F. Ilzig, Hans Scheidemann
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Dec 12, 1979
Inventors
Karl F. Ilzig
Hans Scheidemann
Assignee (at issue)
Original Hanau Heraeus GmbH
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.