Granted Patent
Utility
US 6,441,809 · App. 09/862,672
Acoustic touch position sensor using a low acoustic loss transparent substrate
Inventors:
Joel C. Kent, Masahiro Tsumura
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: May 22, 2001
Inventors
Joel C. Kent
Masahiro Tsumura
Assignee (at issue)
ELO TouchSystems, 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.