Granted Patent
Utility
US 4,469,642 · App. 06/480,726
Condensation of ring-substituted phenylacetonitriles with mono-esters of dicarboxylic acids
Inventor:
Robert C. Ligon
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Mar 31, 1983
Inventor
Robert C. Ligon
Assignee (at issue)
Union Carbide Corporation
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.