Granted Patent
Utility
US 4,847,636 · App. 07/287,578
Thermal drop-on-demand ink jet print head
Inventors:
Robert C. Durbeck, Jerome M. Eldridge, Francis Chee-Shuen Lee, Graham Olive
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Dec 15, 1988
Inventors
Robert C. Durbeck
Jerome M. Eldridge
Francis Chee-Shuen Lee
Graham Olive
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.