Granted Patent
Utility
US 4,786,327 · App. 06/912,868
Dye preparation for thermal ink-jet printheads using ion exchange
Inventors:
Donald E. Wenzel, Loren E. Johnson, Hiang P. Lauw
Patented Case
View Patent ↗
Granted: Nov 22, 1988
Filed: Sep 29, 1986
Inventors
Donald E. Wenzel
Loren E. Johnson
Hiang P. Lauw
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.