Granted Patent
Utility
US 6,828,550 · App. 10/459,791
External shutter for electrospray ionization mass spectrometry
Inventors:
Richard H. Griffey, Steven A. Hofstadler
Patented Case
View Patent ↗
Granted: Dec 7, 2004
Filed: Jun 12, 2003
Inventors
Richard H. Griffey
Steven A. Hofstadler
Assignee (at issue)
Isis Pharmaceuticals, Inc.
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.