Granted Patent
Utility
US 5,495,137 · App. 08/298,864
Proximity sensor utilizing polymer piezoelectric film with protective metal layer
Inventors:
Kyung-Tae Park, Minoru Toda
Patented Case
View Patent ↗
Granted: Feb 27, 1996
Filed: Aug 31, 1994
Inventors
Kyung-Tae Park
Minoru Toda
Assignee (at issue)
Whitaker & Company
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.