Granted Patent
Utility
US 4,384,471 · App. 06/214,911
Chromatographic analysis of hydrocarbon mixtures
Inventor:
Clarence S. Wentzel
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Dec 10, 1980
Inventor
Clarence S. Wentzel
Assignee (at issue)
Engelhard Minerals & Chemicals Corporation
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.