Granted Patent
Utility
US 5,614,015 · App. 08/528,145
Process for the preparation of 4,10-dibromoanthanthrone pigment
Inventors:
Manfred Urban, Gerhard Wilker
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Sep 14, 1995
Inventors
Manfred Urban
Gerhard Wilker
Assignee (at issue)
Hoechst GmbH
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.