Granted Patent
Utility
US 5,281,263 · App. 07/822,909
Azo dyes containing a carboxy group
Inventors:
Peter Gregory, Prahalad Manibhai Mistry
Patented Case
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Granted: Jan 25, 1994
Filed: Jan 21, 1992
Inventors
Peter Gregory
Prahalad Manibhai Mistry
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.