Granted Patent
Utility
US 4,746,589 · App. 07/081,575
Developing method in electrophotography using oscillating electric field
Inventors:
Satoshi Haneda, Seiichiro Hiratsuka
Patented Case
View Patent ↗
Granted: May 24, 1988
Filed: Jul 31, 1987
Inventors
Satoshi Haneda
Seiichiro Hiratsuka
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.