Granted Patent
Utility
US 5,391,806 · App. 08/131,549
Heat-sensitive recording materials and phenol compounds
Inventors:
Atsuo Otsuji, Toshihiro Motoshima, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Masakatsu Nakatsuka, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Feb 21, 1995
Filed: Oct 5, 1993
Inventors
Atsuo Otsuji
Toshihiro Motoshima
Yoshimitsu Tanabe
Kiyoharu Hasegawa
Kazuyoshi Kikkawa
Masakatsu Nakatsuka
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.