Granted Patent
Utility
US 5,202,703 · App. 07/615,898
Piezoelectric transducers for ink jet systems
Inventors:
Paul A. Hoisington, Bruce A. Paulson
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Nov 20, 1990
Inventors
Paul A. Hoisington
Bruce A. Paulson
Assignee (at issue)
Spectra Group Limited, 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.