Granted Patent
Utility
US 4,331,967 · App. 06/117,186
Field effects semiconductor devices
Inventors:
Katsuhiko Kurumada, Kazuyoshi Asai, Yasunobu Ishii
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Jan 31, 1980
Inventors
Katsuhiko Kurumada
Kazuyoshi Asai
Yasunobu Ishii
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.