Granted Patent
Utility
US 4,783,557 · App. 07/094,883
Processes for preparing hydroxynaphthalenes
Inventors:
Yutaka Haneda, Sadao Yoshimoto, Hisaya Miki, Masaaki Yasuda, Shintarou Araki, Masatoshi Nitabaru
Patented Case
View Patent ↗
Granted: Nov 8, 1988
Filed: Sep 10, 1987
Inventors
Yutaka Haneda
Sadao Yoshimoto
Hisaya Miki
Masaaki Yasuda
Shintarou Araki
Masatoshi Nitabaru
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.