Granted Patent
Utility
US 4,606,827 · App. 06/616,170
Method for separating and recovering color developing agent
Inventors:
Christer Ernstson, Yousuke Sadahiro
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Jun 1, 1984
Inventors
Christer Ernstson
Yousuke Sadahiro
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.