Granted Patent
Utility
US 6,565,755 · App. 09/889,810
Sludge density measurement for controlling a sludge treatment stage
Inventor:
Peter Granville Holdsworth
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Jul 20, 2001
Inventor
Peter Granville Holdsworth
Assignee (at issue)
Ciba Specialty Chemicals Water Treatments Ltd.
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.