Granted Patent
Utility
US 4,594,159 · App. 06/667,155
Process and apparatus for applying back pressure in a liquid chromatography system
Inventor:
Ralph Stalberg
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Nov 1, 1984
Inventor
Ralph Stalberg
Assignee (at issue)
Pharmacia AB
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.