Granted Patent
Utility
US 4,974,031 · App. 07/311,025
Toner collecting device
Inventors:
Junichi Koiso, Takayoshi Hashimoto, Toshio Shida
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Feb 17, 1989
Inventors
Junichi Koiso
Takayoshi Hashimoto
Toshio Shida
Assignee (at issue)
Konica 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.