Granted Patent
Utility
US 4,551,307 · App. 06/381,794
Analytical element
Inventors:
Mikio Koyama, Shozo Kikugawa, Kenichiro Okaniwa
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: May 25, 1982
Inventors
Mikio Koyama
Shozo Kikugawa
Kenichiro Okaniwa
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.