Granted Patent
Utility
US 5,072,427 · App. 07/614,494
Acoustic touch position sensor with shear to lamb wave conversion
Inventor:
Terence J. Knowles
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Nov 16, 1990
Inventor
Terence J. Knowles
Assignee (at issue)
Exzec, Inc.
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.