Granted Patent
Utility
US 4,889,781 · App. 07/196,855
Process and apparatus for producing a black matrix layer
Inventors:
Volker Gerstle, Gerhard Mauz
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: May 19, 1988
Inventors
Volker Gerstle
Gerhard Mauz
Assignee (at issue)
Nokia Graetz
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.