Granted Patent
Utility
US 4,871,647 · App. 07/185,374
Method of forming color diffusion transfer image by heat development
Inventors:
Tawara Komamura, Satoru Ikeuchi, Masaru Iwagaki, Takashi Sasaki, Wataru Ishikawa
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Apr 22, 1988
Inventors
Tawara Komamura
Satoru Ikeuchi
Masaru Iwagaki
Takashi Sasaki
Wataru Ishikawa
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.