Granted Patent
Utility
US 6,644,196 · App. 09/991,784
Electrorheological inker
Inventor:
Arndt Oetjen
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Nov 5, 2001
Inventor
Arndt Oetjen
Assignee (at issue)
Heidelberger Druckmaschinen AG
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.