Granted Patent
Utility
US 5,024,821 · App. 07/486,494
Solvent extraction process
Inventors:
James N. Greenshields, Peter Eric Tetlow
Patented Case
View Patent ↗
Granted: Jun 18, 1991
Filed: Feb 28, 1990
Inventors
James N. Greenshields
Peter Eric Tetlow
Assignee (at issue)
ICI Americas, 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.