Granted Patent
Utility
US 4,922,020 · App. 07/169,573
1,1,5,5-tetra(4-aminophenyl)-pentadi-1,4-ene compounds
Inventors:
Peter Gregory, Nigel Hughes
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Mar 17, 1988
Inventors
Peter Gregory
Nigel Hughes
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.