Granted Patent
Utility
US 4,557,901 · App. 06/437,691
Analytical element
Inventors:
Mikio Koyama, Kenichiro Okaniwa, Masakuni Saruhashi, Yuko Ohmachi
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Oct 29, 1982
Inventors
Mikio Koyama
Kenichiro Okaniwa
Masakuni Saruhashi
Yuko Ohmachi
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.