Granted Patent
Utility
US 5,135,657 · App. 07/750,153
Chromatographic method with micellar on-column enrichment
Inventor:
Apostolos P. Zavitsanos
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Aug 26, 1991
Inventor
Apostolos P. Zavitsanos
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.