Granted Patent
Utility
US 6,836,545 · App. 09/270,676
Communication system, exchange and communication holding control method
Inventors:
Takahiro Abe, Shinji Saitou
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Mar 16, 1999
Inventors
Takahiro Abe
Shinji Saitou
Assignee (at issue)
Hitachi Telecom Technologies, Ltd
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.