Granted Patent
Utility
US 4,245,227 · App. 06/093,490
Ink jet head having an outer wall of ink cavity of piezoelectric material
Inventor:
Konrad A. Krause
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Nov 13, 1979
Inventor
Konrad A. Krause
Assignee (at issue)
International Business Machines Corporation
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.