Granted Patent
Utility
US 4,193,800 · App. 05/952,816
Photographic dye mordant
Inventors:
Hideaki Iwama, Mikio Koyama, Yasuo Tsuda, Masao Asano
Patented Case
View Patent ↗
Granted: Mar 18, 1980
Filed: Oct 19, 1978
Inventors
Hideaki Iwama
Mikio Koyama
Yasuo Tsuda
Masao Asano
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.