Granted Patent
Utility
US 5,245,049 · App. 07/729,299
Crystals of fluoran compound, crystalline solvates thereof and process for their preparation
Inventors:
Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Sep 14, 1993
Filed: Jul 12, 1991
Inventors
Atsuo Otsuji
Masakatsu Nakatsuka
Kiyoharu Hasegawa
Kazuyoshi Kikkawa
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.