Granted Patent
Utility
US 5,932,998 · App. 09/012,893
System for determining fundamental frequency of an AC signal
Inventor:
Niels LaWhite
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Jan 23, 1998
Inventor
Niels LaWhite
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.