Granted Patent
Utility
US 5,942,752 · App. 08/857,431
Higher pressure ion source for two dimensional radio-frequency quadrupole electric field for mass spectrometer
Inventor:
Mingda Wang
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: May 16, 1997
Inventor
Mingda Wang
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.