Granted Patent
Utility
US 4,899,367 · App. 07/305,170
Multi-level quadrature amplitude modulator system with fading compensation means
Inventor:
Seiichi Sampei
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Feb 2, 1989
Inventor
Seiichi Sampei
Assignee (at issue)
Communications Research Laboratory, Ministry of Posts and Telecommunications
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.