Granted Patent
Utility
US 4,591,442 · App. 06/674,600
Flash chromatography
Inventor:
Robert S. Andrews
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Nov 26, 1984
Inventor
Robert S. Andrews
Assignee (at issue)
Nelson Research & Development Company
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.