Granted Patent
Utility
US 5,189,684 · App. 07/582,207
Line signal deterioration removing systems
Inventors:
Takashi Kaku, Hiroki KISHIMOTO, Kyoko Hirao
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Oct 2, 1990
Inventors
Takashi Kaku
Hiroki KISHIMOTO
Kyoko Hirao
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.