Granted Patent
Utility
US 5,264,034 · App. 07/829,046
Pigment preparations based on perylene compounds
Inventors:
Erwin Dietz, Manfred Urban
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Mar 6, 1992
Inventors
Erwin Dietz
Manfred Urban
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.