Granted Patent
Utility
US 4,873,142 · App. 07/104,555
Acrylic fibers having superior abrasion/fatigue resistance
Inventor:
Hartwig C. Bach
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Sep 30, 1987
Inventor
Hartwig C. Bach
Assignee (at issue)
Monsanto 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.