Granted Patent
Utility
US 4,333,064 · App. 06/152,558
Switched-capacitor filter
Inventors:
Seiji Kato, Norio Ueno, Mitsuo Kakuishi, Akihiko Ito, Atsushi Iwata
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: May 23, 1980
Inventors
Seiji Kato
Norio Ueno
Mitsuo Kakuishi
Akihiko Ito
Atsushi Iwata
Assignees (at issue)
Fujitsu Limited
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.