Granted Patent
Utility
US 4,398,672 · App. 06/245,209
Electrostatic spraying
Inventors:
Arthur John Arnold, Barry J. Pye
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Mar 18, 1981
Inventors
Arthur John Arnold
Barry J. Pye
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.