Granted Patent
Utility
US 4,425,422 · App. 06/375,547
Formation of color photographic image with azo dye containing alkoxy or thioalkoxy metal chelating group
Inventors:
Tawara Komamura, Jiro Takahashi, Ryuichiro Kobayashi
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: May 6, 1982
Inventors
Tawara Komamura
Jiro Takahashi
Ryuichiro Kobayashi
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.