Granted Patent
Utility
US 4,484,935 · App. 06/509,612
Permeation modified membrane
Inventor:
Anthony Zampini
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Jun 30, 1983
Inventor
Anthony Zampini
Assignee (at issue)
Monsanto Company
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.