Granted Patent
Utility
US 4,818,894 · App. 07/023,502
Method and apparatus for obtaining high frequency resolution of a low frequency signal
Inventor:
George D. Underwood
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Mar 9, 1987
Inventor
George D. Underwood
Assignee (at issue)
Hughes Aircraft Company
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.