Granted Patent
Utility
US 6,124,012 · App. 09/162,755
Solid phase extraction disk and apparatus for enhanced recovery and precision
Inventors:
Walter Jones, Alfonso Liu, James C. Robbins, Joseph Stefkovich
Patented Case
View Patent ↗
Granted: Sep 26, 2000
Filed: Sep 29, 1998
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.