Granted Patent
Utility
US 4,414,487 · App. 06/311,238
Superconducting electron beam generator
Inventors:
Tsutomu Yamashita, Jinichi Matsuda
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Oct 14, 1981
Inventors
Tsutomu Yamashita
Jinichi Matsuda
Assignee (at issue)
Technological University of Nagaoka
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.