Granted Patent
Utility
US 6,395,228 · App. 08/117,453
Sampling and analysis system
Inventors:
Steven M. Maggard, James H. Higginbotham, Joseph H. Walker
Patented Case
View Patent ↗
Granted: May 28, 2002
Filed: Sep 7, 1993
Inventors
Steven M. Maggard
James H. Higginbotham
Joseph H. Walker
Assignee (at issue)
Marathon Ashland Petroleum LLC
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.