Granted Patent
Utility
US 6,409,924 · App. 09/674,340
Method for removing oil from water
Inventors:
Michael R. Johnson, Jeffrey J. Smith
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Apr 2, 2001
Inventors
Michael R. Johnson
Jeffrey J. Smith
Assignee (at issue)
AMCOL INTERNATIONAL 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.