Granted Patent
Utility
US 6,497,822 · App. 09/915,859
Chemical feeder
Inventors:
David W. Blanchette, Christopher Zetena, Michael Paloian, G. Warren Ginn
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: Jul 26, 2001
Inventors
David W. Blanchette
Christopher Zetena
Michael Paloian
G. Warren Ginn
Assignee (at issue)
Arch Chemicals, Inc.
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.