Granted Patent
Utility
US 4,791,438 · App. 07/115,013
Balanced capillary ink jet pen for ink jet printing systems
Inventors:
Gary Hanson, Gar P. Kelly, C. S. Chan, Bruce Cowger, James G. Bearss
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Oct 28, 1987
Inventors
Gary Hanson
Gar P. Kelly
C. S. Chan
Bruce Cowger
James G. Bearss
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.