Granted Patent
Utility
US 4,692,285 · App. 06/750,443
Process of preparing nonfibrous, piezoelectric polymer sheet of improved activity
Inventors:
Philip E. Bloomfield, Seymour Preis
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Jul 1, 1985
Inventors
Philip E. Bloomfield
Seymour Preis
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.