Granted Patent
Utility
US 4,254,213 · App. 06/115,809
Process for forming black dye images
Inventors:
Kosaku Masuda, Hajime Wada, Kiyoshi Yamashita
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Jan 28, 1980
Inventors
Kosaku Masuda
Hajime Wada
Kiyoshi Yamashita
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.