Granted Patent
Utility
US 4,990,777 · App. 07/487,629
Rod assembly for multipole mass spectrometers
Inventors:
James Walter Hurst, Robert M. Smith, John Horth
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Mar 2, 1990
Inventors
James Walter Hurst
Robert M. Smith
John Horth
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.