Granted Patent
Utility
US 4,209,307 · App. 05/890,554
Method for filtering through highly permeable acrylic hollow fibers
Inventor:
Richard L. Leonard
Patented Case
View Patent ↗
Granted: Jun 24, 1980
Filed: Mar 20, 1978
Inventor
Richard L. Leonard
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.