Granted Patent
Utility
US 5,662,827 · App. 08/393,063
Diquaternary compounds useful as bleach activators, and compositions containing them
Inventors:
Philip H. Steiger, Shaun F. Clancy, Owen Portwood
Patented Case
View Patent ↗
Granted: Sep 2, 1997
Filed: Feb 23, 1995
Inventors
Philip H. Steiger
Shaun F. Clancy
Owen Portwood
Assignee (at issue)
Witco Corporation
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.