Granted Patent
Utility
US 4,980,557 · App. 07/202,524
Method and apparatus surface ionization particulate detectors
Inventors:
Richard L. Myers, Edward L. McCall
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Jun 6, 1988
Inventors
Richard L. Myers
Edward L. McCall
Assignee (at issue)
Extrel 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.