Granted Patent
Utility
US 5,852,159 · App. 08/646,679
Plastic with reduced sulfur uptake rate
Inventors:
Matthias Zäh, Gerhard Pfahler, Karl Gaa, Klaus Keck-Antoine
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: May 10, 1996
Inventors
Matthias Zäh
Gerhard Pfahler
Karl Gaa
Klaus Keck-Antoine
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.