Granted Patent
Utility
US 4,351,774 · App. 06/132,054
Process for the production of methoxyanthraquinones
Inventors:
Peter Baumgartner, Urs Karlen, Urs Keller
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Mar 20, 1980
Inventors
Peter Baumgartner
Urs Karlen
Urs Keller
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.