Granted Patent
Utility
US 4,840,864 · App. 07/134,344
New electrostatographic toners and developers containing new charge-control agents
Inventors:
Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Dec 17, 1987
Inventors
Douglas E. Bugner
Peter S. Alexandrovich
Lawrence P. DeMejo
Robert A. Guistina
James H. Anderson
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.