Granted Patent
Utility
US 5,207,829 · App. 07/803,346
Pigment preparations
Inventors:
Wolfgang Schwab, Erwin Dietz
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Dec 4, 1991
Inventors
Wolfgang Schwab
Erwin Dietz
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.