Granted Patent
Utility
US 5,481,017 · App. 08/268,829
Method for preparing 6H-dibenzo[c,e][1,2]oxaphosphorin-6-one
Inventor:
Hans-Jerg Kleiner
Patented Case
View Patent ↗
Granted: Jan 2, 1996
Filed: Jun 30, 1994
Inventor
Hans-Jerg Kleiner
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.