Granted Patent
Utility
US 5,354,472 · App. 07/981,912
Anion exchange materials comprised of derivatized cellulose-polyester composites
Inventors:
Marc E. Voorhees, Ben F. Brian, III, Lloyd Forrestal
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Nov 23, 1992
Inventors
Marc E. Voorhees
Ben F. Brian, III
Lloyd Forrestal
Assignee (at issue)
COBE Cardiovascular, Inc.
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.