Granted Patent
Utility
US 4,611,343 · App. 06/625,940
Audio spectrum analyzer operable in a difference mode
Inventor:
Mark Rapaich
Patented Case
View Patent ↗
Granted: Sep 9, 1986
Filed: Jun 29, 1984
Inventor
Mark Rapaich
Assignee (at issue)
Heath Consultants Incorporated
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.