Granted Patent
Utility
US 4,491,627 · App. 06/456,780
Light-sensitive silver halide photographic material with microcapsules that dissolve at pH of at least 7
Inventors:
Toshifumi Iijima, Shigeharu Koboshi, Hiroshi Yamazaki
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Jan 10, 1983
Inventors
Toshifumi Iijima
Shigeharu Koboshi
Hiroshi Yamazaki
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.