Granted Patent
Utility
US 5,189,162 · App. 07/607,687
Unsymmetrical triphenodixoazine reactive dyes
Inventor:
Peter J. Smith
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Nov 1, 1990
Inventor
Peter J. Smith
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.