Granted Patent
Utility
US 5,296,033 · App. 08/080,080
Process for the production of pigment preparations based on phythalocyanine pigments
Inventors:
Erwin Dietz, Manfred Urban
Patented Case
View Patent ↗
Granted: Mar 22, 1994
Filed: Jun 18, 1993
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.