Granted Patent
Utility
US 6,835,929 · App. 10/351,696
Coaxial atmospheric pressure photoionization source for mass spectrometers
Inventor:
Jeffrey W. Finch
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Jan 27, 2003
Inventor
Jeffrey W. Finch
Assignee (at issue)
Waters Investments Limited
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.