Granted Patent
Utility
US 6,554,403 · App. 10/135,297
Substrate for fluid ejection device
Inventors:
Chien-Hua Chen, Kenneth M. Kramer
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Apr 30, 2002
Inventors
Chien-Hua Chen
Kenneth M. Kramer
Assignee (at issue)
Hewlett-Packard Development 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.