Granted Patent
Utility
US 4,393,358 · App. 06/322,331
Surface wave acoustic device with compensation for diffraction effects
Inventor:
Adrian J. De Vries
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Nov 18, 1981
Inventor
Adrian J. De Vries
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.