Granted Patent
Utility
US 5,342,439 · App. 08/126,468
Bleed resistance of dyes by counter-ion substitution
Inventor:
Hiang P. Lauw
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Sep 24, 1993
Inventor
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.