Granted Patent
Utility
US 4,245,159 · App. 05/962,656
Quick-acting electron-optical lenses
Inventor:
Siegfried Beisswenger
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Nov 21, 1978
Inventor
Siegfried Beisswenger
Assignee (at issue)
Dr. Ing. Rudolf Hell 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.