Granted Patent
Utility
US 5,062,893 · App. 07/542,862
Ink formulations by mixing anionic waterfast dyes containing two or more carboxyl groups
Inventors:
Raymond Adamic, Palitha Wickramanayake, Suraj L. Hindagolla, Garold E. Radke, David J. Halko
Patented Case
View Patent ↗
Granted: Nov 5, 1991
Filed: Jun 22, 1990
Inventors
Raymond Adamic
Palitha Wickramanayake
Suraj L. Hindagolla
Garold E. Radke
David J. Halko
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.