Granted Patent
Utility
US 4,983,906 · App. 07/395,226
Frequency estimation system
Inventor:
Donald R. Hiller
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Aug 17, 1989
Inventor
Donald R. Hiller
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.