Granted Patent
Utility
US 6,731,611 · App. 09/408,475
Method for duplex data transmission with QAM and demodulator for use in the method
Inventor:
Heinrich Schenk
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Sep 28, 1999
Inventor
Heinrich Schenk
Assignee (at issue)
Siemens Aktiengesellschaft
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.