Granted Patent
Utility
US 4,840,834 · App. 07/027,818
Electrostatic recording material
Inventors:
Yasuharu Onogi, Akinori Oka, Masakatsu Nagatomo, Takumi Kondo, Kouji Mizumoto
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Mar 19, 1987
Inventors
Yasuharu Onogi
Akinori Oka
Masakatsu Nagatomo
Takumi Kondo
Kouji Mizumoto
Assignee (at issue)
Oji Paper 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.