Granted Patent
Utility
US 4,435,841 · App. 06/353,694
Communications receiver having a switchable filter input stage
Inventor:
Pierre Dobrovolny
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Mar 1, 1982
Inventor
Pierre Dobrovolny
Assignee (at issue)
Zenith Radio Corporation
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.