Granted Patent
Utility
US 5,804,639 · App. 08/735,089
Pigment preparations having a high solids content
Inventors:
Gert Schopwinkel, Kai Butje, Gunter Wieghaus, Richard Bathke, Torsten Groth, Winfried Joentgen
Patented Case
View Patent ↗
Granted: Sep 8, 1998
Filed: Oct 22, 1996
Inventors
Gert Schopwinkel
Kai Butje
Gunter Wieghaus
Richard Bathke
Torsten Groth
Winfried Joentgen
Assignee (at issue)
Bayer Aktiengesellschaft
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.