Granted Patent
Utility
US 4,837,392 · App. 07/229,046
Dry electrostatographic developer containing toner particles comprising a vinyl addition polymer containing a covalently bound quaternary phosphonium salt
Inventors:
James H. Anderson, Douglas E. Bugner, Lawrence P. DeMejo, Richard C. Sutton, John C. Wilson
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Aug 5, 1988
Inventors
James H. Anderson
Douglas E. Bugner
Lawrence P. DeMejo
Richard C. Sutton
John C. Wilson
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.