Granted Patent
Utility
US 5,029,989 · App. 07/475,504
PLZT shutter
Inventor:
James R. Phillips
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Feb 6, 1990
Inventor
James R. Phillips
Assignee (at issue)
Motorola, 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.