Granted Patent
Utility
US 4,871,939 · App. 07/135,718
Piezoelectric motor
Inventor:
Michael T. Clouser
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Dec 21, 1987
Inventor
Michael T. Clouser
Assignee (at issue)
Emhart Industries, 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.