Granted Patent
Utility
US 4,336,515 · App. 06/195,998
Acoustic filter with harmonic rejection
Inventors:
Adrian J. DeVries, Kai Hansen
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Oct 10, 1980
Inventors
Adrian J. DeVries
Kai Hansen
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.