Granted Patent
Utility
US 5,780,421 · App. 08/647,611
Sulfated/sulfonated surfactants
Inventors:
Richard A. Winstanley, Harald P. Wulff
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: May 13, 1996
Inventors
Richard A. Winstanley
Harald P. Wulff
Assignee (at issue)
Henkel 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.