Granted Patent
Utility
US 4,631,697 · App. 06/676,915
Signal controlled waveform recorder
Inventor:
Hugo S. Ferguson
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Nov 30, 1984
Inventor
Hugo S. Ferguson
Assignee (at issue)
Duffers Scientific, Inc.
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.