Granted Patent
Utility
US 4,199,767 · App. 06/012,987
Nozzle valve for ink jet printers
Inventors:
Alan Stirling Campbell, Jack H. Jennings
Patented Case
View Patent ↗
Granted: Apr 22, 1980
Filed: Feb 21, 1979
Inventors
Alan Stirling Campbell
Jack H. Jennings
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.