Granted Patent
Utility
US 5,158,787 · App. 07/331,980
Process for the production of hydrogen cyanide
Inventors:
Yutaka Sasaki, Hiroshi Utsumi, Masato Otani
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Apr 3, 1989
Inventors
Yutaka Sasaki
Hiroshi Utsumi
Masato Otani
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.