Granted Patent
Utility
US 5,891,231 · App. 08/855,413
Process for preparing pigment dispersions used in inks
Inventors:
Robin Gant Gnerlich, Anna Marie Pearson, Ashok Vishnu Gangal
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: May 13, 1997
Inventors
Robin Gant Gnerlich
Anna Marie Pearson
Ashok Vishnu Gangal
Assignee (at issue)
Lexmark International, Inc.
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.