Granted Patent
Utility
US 4,540,884 · App. 06/454,351
Method of mass analyzing a sample by use of a quadrupole ion trap
Inventors:
George C. Stafford, Paul E. Kelley, David R. Stephens
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Dec 29, 1982
Inventors
George C. Stafford
Paul E. Kelley
David R. Stephens
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.