Granted Patent
Utility
US 6,660,857 · App. 10/210,878
Process for the preparation of &egr;-caprolactam
Inventors:
Frank P. W. Agterberg, Rudolf P. M. Guit, Matthias R. J. Offermanns
Patented Case
View Patent ↗
Granted: Dec 9, 2003
Filed: Aug 2, 2002
Inventors
Frank P. W. Agterberg
Rudolf P. M. Guit
Matthias R. J. Offermanns
Assignee (at issue)
DSM N.V.
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.