Granted Patent
Utility
US 5,561,020 · App. 08/350,775
Quaternary phosphonium trihalozincate salts as charge-control agents for toners and developers
Inventors:
John C. Wilson, Dinesh Tyagi
Patented Case
View Patent ↗
Granted: Oct 1, 1996
Filed: Dec 7, 1994
Inventors
John C. Wilson
Dinesh Tyagi
Assignee (at issue)
EASTMAN KODAK COMPANY
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.