Granted Patent
Utility
US 4,894,470 · App. 07/163,797
Process for the preparation of dialkyl vinylphosphonates
Inventors:
Gunter Roscher, Hans-Jerg Kleiner, Gabriele Ihl, Hermann Leipe
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Mar 3, 1988
Inventors
Gunter Roscher
Hans-Jerg Kleiner
Gabriele Ihl
Hermann Leipe
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.