Granted Patent
Utility
US 4,268,671 · App. 05/895,948
Fluorescent dyes
Inventors:
Seiichi Imahori, Yukichi Murata, Syuichi Maeda, Sumio Suzuki
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Apr 13, 1978
Inventors
Seiichi Imahori
Yukichi Murata
Syuichi Maeda
Sumio Suzuki
Assignee (at issue)
Mitsubishi Chemical Industries, 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.