Granted Patent
Utility
US 5,689,513 · App. 08/624,055
Data transmission system having a backup testing facility
Inventors:
Ryoji Okita, Tohru Ogawa, Michiko Kawada
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Mar 29, 1996
Inventors
Ryoji Okita
Tohru Ogawa
Michiko Kawada
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.