Granted Patent
Utility
US 6,323,289 · App. 09/574,372
Extrusion process for enhancing the melt strength of polypropylene
Inventors:
Andreas Herman Hogt, Bart Fischer, Geesje Klasina Spijkerman
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: May 19, 2000
Inventors
Andreas Herman Hogt
Bart Fischer
Geesje Klasina Spijkerman
Assignee (at issue)
AKZO NOBEL N.V.
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.