Granted Patent
Utility
US 5,412,211 · App. 08/253,548
Environmental scanning electron microscope
Inventor:
W. Ralph Knowles
Patented Case
View Patent ↗
Granted: May 2, 1995
Filed: Jun 3, 1994
Inventor
W. Ralph Knowles
Assignee (at issue)
ElectroScan Corporation
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.