Granted Patent
Utility
US 6,221,488 · App. 09/626,363
Modified polyester with high intrinsic viscosity at moderate strength
Inventors:
Billy Mack Humelsine, Carl Steven Nichols
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Jul 27, 2000
Inventors
Billy Mack Humelsine
Carl Steven Nichols
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.