Granted Patent
Utility
US 4,400,622 · App. 06/225,269
Electron lens equipment
Inventors:
Yoshinobu Takeuchi, Katsuhiro Kuroda, Susumu Ozasa
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Jan 15, 1981
Inventors
Yoshinobu Takeuchi
Katsuhiro Kuroda
Susumu Ozasa
Assignees (at issue)
Nippon Telegraph and Telephone Public Corporation
HITACHI, LTD.
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.