Granted Patent
Utility
US 6,590,864 · App. 09/472,955
Protection switching using standby system for transmission of line status signals
Inventor:
Kazuya Suzuki
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Dec 27, 1999
Inventor
Kazuya Suzuki
Assignee (at issue)
NEC 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.