Granted Patent
Utility
US 4,461,752 · App. 06/468,528
Process for the production of hydrogen cyanide
Inventors:
Yutaka Sasaki, Hiroshi Utsumi
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Feb 22, 1983
Inventors
Yutaka Sasaki
Hiroshi Utsumi
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.