Granted Patent
Utility
US 5,300,661 · App. 08/094,727
Process for preparation of a recording material comprising a novel crystal of a fluoran compound
Inventors:
Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Jul 21, 1993
Inventors
Masakatsu Nakatsuka
Atsuo Otsuji
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.