Granted Patent
Utility
US 6,574,191 · App. 09/391,409
Line switching system and method
Inventors:
Takashi Usukura, Toshio Suzuki
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Sep 8, 1999
Inventors
Takashi Usukura
Toshio 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.