Granted Patent
Utility
US 4,897,332 · App. 07/253,788
Charge control agent combination of lecithin and pyrrolidone polymer for liquid toner and methods of use
Inventors:
George A. Gibson, Ray H. Luebbe, Jr.
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 5, 1988
Inventors
George A. Gibson
Ray H. Luebbe, Jr.
Assignee (at issue)
AM 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.