Granted Patent
Utility
US 6,639,213 · App. 09/798,032
Periodic field focusing ion mobility spectrometer
Inventors:
Kent J. Gillig, David H. Russell
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Feb 28, 2001
Inventors
Kent J. Gillig
David H. Russell
Assignees (at issue)
THE TEXAS A&M UNIVERSITY SYSTEM
Ionwerks, 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.