Granted Patent
Utility
US 5,081,389 · App. 07/620,025
Crystal cut angles for lithium tantalate crystal for novel surface acoustic wave devices
Inventors:
Benjamin Paul Abbott, Thor Thorvaldsson
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Nov 30, 1990
Inventors
Benjamin Paul Abbott
Thor Thorvaldsson
Assignee (at issue)
Ascom Zelcom 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.