Granted Patent
Utility
US 6,677,421 · App. 10/222,378
Process for the preparation of isoolefin copolymers
Inventors:
Gerhard Langstein, Jurgen Ismeier, Martin Bohnenpoll, Hans Krauss, Rui Resendes
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: Aug 16, 2002
Inventors
Gerhard Langstein
Jurgen Ismeier
Martin Bohnenpoll
Hans Krauss
Rui Resendes
Assignee (at issue)
Bayer Aktiengesellschaft
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.