Granted Patent
Utility
US 4,778,899 · App. 07/002,354
Process for the preparation of pyrrolo (3,4-c) pyrroles
Inventors:
Johannes Pfenninger, Abul Iqbal, Alain C. Rochat, Olof Wallquist
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Jan 12, 1987
Inventors
Johannes Pfenninger
Abul Iqbal
Alain C. Rochat
Olof Wallquist
Assignee (at issue)
Ciba-Geigy
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.