Granted Patent
Utility
US 6,218,972 · App. 08/927,766
Tunable bandpass sigma-delta digital receiver
Inventor:
Richard A. Groshong
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Sep 11, 1997
Inventor
Richard A. Groshong
Assignee (at issue)
Rockwell Science Center, LLC
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.