Granted Patent
Utility
US 5,236,644 · App. 07/782,348
Process of making membrane for removal of low density lipoprotein-cholesterol from whole blood
Inventors:
Marc E. Parham, Richard L. Duffy, Donald T. Nicholson
Patented Case
View Patent ↗
Granted: Aug 17, 1993
Filed: Oct 31, 1991
Inventors
Marc E. Parham
Richard L. Duffy
Donald T. Nicholson
Assignee (at issue)
W.R. Grace & Co. Conn.
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.