Granted Patent
Utility
US 4,652,283 · App. 06/509,633
Polyphenylene oxide membrane having chemically bonded coating
Inventors:
Anthony Zampini, Raymond F. Malon
Patented Case
View Patent ↗
Granted: Mar 24, 1987
Filed: Jun 30, 1983
Inventors
Anthony Zampini
Raymond F. Malon
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.