Granted Patent
Utility
US 6,042,642 · App. 09/173,301
Iron oxide yellow pigments, a method of producing iron oxide yellow pigments and the use thereof
Inventors:
Rolf Braun, Eckhard Bayer, Ulrich Meisen
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Oct 15, 1998
Inventors
Rolf Braun
Eckhard Bayer
Ulrich Meisen
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.