Granted Patent
Utility
US 4,951,172 · App. 07/221,779
Method and apparatus for regulating air ionization
Inventors:
Arnold J. Steinman, Michael G. Yost
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Jul 20, 1988
Inventors
Arnold J. Steinman
Michael G. Yost
Assignee (at issue)
Ion Systems, 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.