Granted Patent
Utility
US 4,860,924 · App. 07/224,231
Liquid developer charge director control
Inventors:
Robert M. Simms, George A. Gibson
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jul 25, 1988
Inventors
Robert M. Simms
George A. Gibson
Assignee (at issue)
Savin Corporation
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.