Granted Patent
Utility
US 6,489,502 · App. 09/729,542
Process for preparing phosphoric acid esters
Inventors:
Nikolaus Janke, Manfred Pieroth, Dieter Heinz, Werner Bäcker
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Dec 4, 2000
Inventors
Nikolaus Janke
Manfred Pieroth
Dieter Heinz
Werner Bäcker
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.