Granted Patent
Utility
US 4,764,947 · App. 06/804,428
Cathode focusing arrangement
Inventor:
Leonard Lesensky
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Dec 4, 1985
Inventor
Leonard Lesensky
Assignee (at issue)
The Machlett Laboratories, 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.