Granted Patent
Utility
US 5,188,641 · App. 07/819,583
Colored polymers from azo dye monomers containing olefinic groups
Inventor:
Brian Parton
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Jan 9, 1992
Inventor
Brian Parton
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.