Granted Patent
Utility
US 4,931,391 · App. 07/045,869
Method for preservation of nitrile hydration activity
Inventors:
Kanehiko Enomoto, Koitchiro Ryuno, Hitoshi Shimizu
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: May 1, 1987
Inventors
Kanehiko Enomoto
Koitchiro Ryuno
Hitoshi Shimizu
Assignees (at issue)
MITSUBISHI ELECTRIC CORPORATION
Nitto Kagaku Kogyo Kabushiki Kaisha
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.