Granted Patent
Utility
US 4,627,077 · App. 06/677,509
Modified QAM data point constellation for secondary channel signalling
Inventor:
Thomas R. Armstrong
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Dec 3, 1984
Inventor
Thomas R. Armstrong
Assignee (at issue)
PARADYNE 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.