Granted Patent
Utility
US 5,160,721 · App. 07/253,526
Process for maintaining high level of yield of acrylonitrile and hydrogen cyanide in ammoxidation of propylene
Inventors:
Yutaka Sasaki, Yutaka Kiyomiya, Toshio Nakamura, Kunio Mori, Akimitsu Morii
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Oct 5, 1988
Inventors
Yutaka Sasaki
Yutaka Kiyomiya
Toshio Nakamura
Kunio Mori
Akimitsu Morii
Assignee (at issue)
Nitto Chemical Industry Co., 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.