Granted Patent
Utility
US 6,590,069 · App. 10/017,400
Methods of post-polymerization extruder injection in condensation polymer production
Inventors:
Carl Steven Nichols, Tony Clifford Moore, Robert Joseph Schiavone, Walter Lee Edwards
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: Dec 14, 2001
Inventors
Carl Steven Nichols
Tony Clifford Moore
Robert Joseph Schiavone
Walter Lee Edwards
Assignee (at issue)
Wellman 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.