Granted Patent
Utility
US 5,081,453 · App. 07/405,027
Detecting apparatus for detecting input operation in a switching matrix
Inventors:
Norio Endoh, Shigeo Tanji, Kazutoshi Hayashi, Hideo Yamada
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Sep 11, 1989
Inventors
Norio Endoh
Shigeo Tanji
Kazutoshi Hayashi
Hideo Yamada
Assignee (at issue)
Fujitsu Limited
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.