Granted Patent
Utility
US 4,791,436 · App. 07/121,439
Nozzle plate geometry for ink jet pens and method of manufacture
Inventors:
C. S. Chan, Gary Hanson
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Nov 17, 1987
Inventors
C. S. Chan
Gary Hanson
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.