Granted Patent
Utility
US 6,548,558 · App. 09/812,255
Contaminant dispersants useful in recycling of treated containers
Inventors:
Steven John Severtson, Martin J. Coffey
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: May 17, 2001
Inventors
Steven John Severtson
Martin J. Coffey
Assignee (at issue)
Ondeo Nalco Company
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.