Granted Patent
Utility
US 4,423,324 · App. 06/059,961
Apparatus for detecting negative ions
Inventor:
George C. Stafford
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jul 23, 1979
Inventor
George C. Stafford
Assignee (at issue)
Finnigan 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.