Granted Patent
Utility
US 4,470,929 · App. 06/480,733
Condensation of substituted phenylacetonitriles with dicarboxylic anhydrides
Inventor:
Robert C. Ligon
Patented Case
View Patent ↗
Granted: Sep 11, 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.