Granted Patent
Utility
US 5,324,704 · App. 08/037,847
Fluoran compounds, crystalline toluene adducts thereof, recording material comprising same and process for their preparation
Inventors:
Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 28, 1994
Filed: Mar 29, 1993
Inventors
Masakatsu Nakatsuka
Atsuo Otsuji
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.