Granted Patent
Utility
US 5,399,746 · App. 08/192,455
Diquaternary bleach activators and compositions containing them
Inventors:
Philip H. Steiger, Shaun F. Clancy, Owen Portwood
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Feb 7, 1994
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.