Granted Patent
Utility
US 5,604,279 · App. 08/402,631
Colorant preparation for producing masterbatches
Inventors:
Uwe Bernhardt, Rainer Bott
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Mar 13, 1995
Inventors
Uwe Bernhardt
Rainer Bott
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.