Granted Patent
Utility
US 5,852,197 · App. 08/680,133
Cyclic disphosphoric esters, a process for their preparation and their use
Inventor:
Horst Staendeke
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Jul 15, 1996
Inventor
Horst Staendeke
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.