Granted Patent
Utility
US 5,198,197 · App. 07/908,458
Apparatus and method for supercritical fluid extraction
Inventors:
Dale L. Clay, Robert W. Allington
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Jul 6, 1992
Inventors
Dale L. Clay
Robert W. Allington
Assignee (at issue)
Isco, Inc.
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.