Granted Patent
Utility
US 4,797,209 · App. 07/129,926
Adjustable distribution cell apparatus
Inventor:
Derek Jackson
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Dec 1, 1987
Inventor
Derek Jackson
Assignee (at issue)
Amicon Wright Ltd.
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.