Granted Patent
Utility
US 4,393,093 · App. 06/272,823
Preparation of high gamma (.alpha.)phase poly(vinylidene fluoride) piezoelectric materials
Inventor:
Oliver S. Sprout, Jr.
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Jun 12, 1981
Inventor
Oliver S. Sprout, Jr.
Assignee (at issue)
Pennwalt Corporation
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.