Granted Patent
Utility
US 4,791,172 · App. 07/103,661
Process for the preparation of partially hydrogenated nitrile rubbers
Inventors:
Johann Hohn, Franz-Josef Mersmann, Werner Obrecht, Zsolt Szentivanyi
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Oct 2, 1987
Inventors
Johann Hohn
Franz-Josef Mersmann
Werner Obrecht
Zsolt Szentivanyi
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.