Granted Patent
Utility
US 6,716,352 · App. 10/031,537
Method for removing and recovering aromatic amines by using a non-porous membrane
Inventor:
Andrew Guy Livingston
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jan 18, 2002
Inventor
Andrew Guy Livingston
Assignee (at issue)
MEMBRANE EXTRACTION TECHNOLOGY 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.