Granted Patent
Utility
US 6,562,916 · App. 09/941,176
Process for the preparation of isoolefin copolymers
Inventors:
Gerhard Langstein, Martin Bohnenpoll
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: Aug 27, 2001
Inventors
Gerhard Langstein
Martin Bohnenpoll
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.