Granted Patent
Utility
US 4,869,889 · App. 07/327,633
Process for the production of hydrogen cyanide
Inventors:
Martin B. Sherwin, Jow-Lih Su
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Mar 23, 1989
Inventors
Martin B. Sherwin
Jow-Lih Su
Assignee (at issue)
W.R. Grace & Co. Conn.
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.