Granted Patent
Utility
US 4,284,996 · App. 06/062,001
Driving ink jet recording elements
Inventor:
Helmut Greve
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jul 30, 1979
Inventor
Helmut Greve
Assignee (at issue)
Dr. Ing. Rudolf Hell 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.