Granted Patent
Utility
US 5,639,886 · App. 08/348,400
One-pot process for the preparation of 3-quinolonecarboxylic acid derivatives
Inventors:
Rudolf Zerbes, Paul Naab, Gerhard Franckowiak, Herbert Diehl
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Dec 2, 1994
Inventors
Rudolf Zerbes
Paul Naab
Gerhard Franckowiak
Herbert Diehl
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.