Granted Patent
Utility
US 5,455,334 · App. 08/196,616
Sulfonamido-phthalocyanine azo fibre-reactive dyestuffs containing a heterocyclic fibre-reactive group
Inventor:
Roland Wald
Patented Case
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Granted: Oct 3, 1995
Filed: Feb 10, 1994
Inventor
Roland Wald
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.