Granted Patent
Utility
US 5,332,491 · App. 08/057,506
Iron sulfide dispersing agents
Inventors:
Sherri L. Fisher, Bradley D. Mercer
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: May 4, 1993
Inventors
Sherri L. Fisher
Bradley D. Mercer
Assignee (at issue)
Nalco Chemical 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.