Granted Patent
Utility
US 4,247,827 · App. 06/005,681
Surface acoustic wave filter arrangement
Inventor:
Rodney J. Lawton
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jan 23, 1979
Inventor
Rodney J. Lawton
Assignee (at issue)
Plessey Handel Und Investments AG
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.