Granted Patent
Utility
US 4,256,822 · App. 06/069,073
Electrophotographic plate containing quaternary ammonium salt polymer interlayer
Inventors:
Noriyoshi Tarumi, Akihiko Tamura, Masakazu Kokiso, Toshio Muramatsu, Koichi Nagayasu
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Aug 23, 1979
Inventors
Noriyoshi Tarumi
Akihiko Tamura
Masakazu Kokiso
Toshio Muramatsu
Koichi Nagayasu
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.