Granted Patent
Utility
US 5,658,662 · App. 08/360,614
High tenacity, low flammability polyester yarn, production thereof and use thereof
Inventor:
Gerhard Leumer
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Dec 21, 1994
Inventor
Gerhard Leumer
Assignee (at issue)
Hoechst GmbH
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.