Granted Patent
Utility
US 4,282,167 · App. 06/112,649
Conversion of amides to isocyanates via phase transfer catalysis
Inventors:
Anita O. Sy, Joseph W. Raksis
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Jan 16, 1980
Inventors
Anita O. Sy
Joseph W. Raksis
Assignee (at issue)
W. R. Grace & Co.
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.