Granted Patent
Utility
US 4,323,908 · App. 06/174,335
Resonant purging of drop-on-demand ink jet print heads
Inventors:
Francis Chee-Shuen Lee, Ross N. Mills, Frank E. Talke
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Aug 1, 1980
Inventors
Francis Chee-Shuen Lee
Ross N. Mills
Frank E. Talke
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.