Granted Patent
Utility
US 4,366,456 · App. 06/156,389
Switched-capacitor filter
Inventors:
Norio Ueno, Seiji Kato, Atsushi Iwata
Patented Case
View Patent ↗
Granted: Dec 28, 1982
Filed: Jun 4, 1980
Inventors
Norio Ueno
Seiji Kato
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.