Granted Patent
Utility
US 4,910,145 · App. 07/374,567
Separation process
Inventors:
Paul A. Holmes, Guan B. Lim
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jun 30, 1989
Inventors
Paul A. Holmes
Guan B. Lim
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.