Granted Patent
Utility
US 5,548,253 · App. 08/423,225
Spectrally efficient quadrature amplitude modulator
Inventor:
Randolph L. Durrant
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: Apr 17, 1995
Inventor
Randolph L. Durrant
Assignee (at issue)
Omnipoint 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.