Granted Patent
Utility
US 4,725,521 · App. 06/910,652
Carrier for developing electrostatic image
Inventors:
Kunio Shigeta, Jiro Takahashi, Kenzi Tsuzita, Hiroyuki Nomori
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Sep 23, 1986
Inventors
Kunio Shigeta
Jiro Takahashi
Kenzi Tsuzita
Hiroyuki Nomori
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.