Granted Patent
Utility
US 6,660,377 · App. 10/176,474
Multilobal hollow filament carpet yarn having stiffening ribs and stiffening webs and spinneret for producing the same
Inventor:
Walter Bernaschek
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Jun 20, 2002
Inventor
Walter Bernaschek
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.