Granted Patent
Utility
US 4,331,875 · App. 06/137,728
Shadow casting electron-beam system
Inventor:
John E. Wolfe
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Apr 7, 1980
Inventor
John E. Wolfe
Assignee (at issue)
Burroughs, 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.