Granted Patent
Utility
US 4,480,338 · App. 06/528,692
Lowpass-highpass electronic switch
Inventor:
Pierre Dobrovolny
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Sep 1, 1983
Inventor
Pierre Dobrovolny
Assignee (at issue)
Zenith Electronics LLC
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.