Granted Patent
Utility
US 4,423,014 · App. 06/226,977
Solvent extraction
Inventors:
Alkis S. Rappas, Lloyd Allen
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jan 21, 1981
Inventors
Alkis S. Rappas
Lloyd Allen
Assignee (at issue)
Cabot 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.