Granted Patent
Utility
US 5,087,706 · App. 07/584,219
Fluoran compounds, process for preparation thereof and recording materials comprising said compound
Inventors:
Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Feb 11, 1992
Filed: Sep 18, 1990
Inventors
Atsuo Otsuji
Masakatsu Nakatsuka
Kiyoharu Hasegawa
Masatoshi Takagi
Akihiro Yamaguchi
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.