Granted Patent
Utility
US 5,990,337 · App. 08/921,654
Process for the preparation of 2-cyanoethylphosphinic esters
Inventor:
Hanss-Jerg Kleiner
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Aug 26, 1997
Inventor
Hanss-Jerg Kleiner
Assignee (at issue)
Ticona LLC
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.