Granted Patent
Utility
US 6,204,397 · App. 08/086,602
Process for the preparation of 3-substituted 4-cyano-pyrrole compounds
Inventors:
Peter C. Knuppel, Reinhard Lantzsch, Klaus Jelich, Peter Andres, Albrecht Marhold
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Jul 1, 1993
Inventors
Peter C. Knuppel
Reinhard Lantzsch
Klaus Jelich
Peter Andres
Albrecht Marhold
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.