Granted Patent
Utility
US 5,849,249 · App. 08/819,004
Solid phase extraction apparatus for enhanced recovery and precision
Inventors:
Walter Jones, Alfonso Liu, James C. Robbins, Joseph Stefkovich
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Mar 17, 1997
Inventors
Walter Jones
Alfonso Liu
James C. Robbins
Joseph Stefkovich
Assignee (at issue)
Whatman GmbH
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.