Granted Patent
Utility
US 6,597,657 · App. 09/478,338
Unit and method for duplex call control for SVC connection
Inventor:
Masashi Tanaka
Patented Case
View Patent ↗
Granted: Jul 22, 2003
Filed: Jan 6, 2000
Inventor
Masashi Tanaka
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.