Granted Patent
Utility
US 5,352,893 · App. 08/090,205
Isotopic-ratio plasma source mass spectrometer
Inventor:
Philip A. Freedman
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Jul 22, 1993
Inventor
Philip A. Freedman
Assignee (at issue)
Fisons plc
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.