Granted Patent
Utility
US 4,781,839 · App. 07/106,474
Method for flocculating and removing solids suspended in water
Inventors:
David W. Kelly, Stewart Paul, John E. Waller
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Oct 8, 1987
Inventors
David W. Kelly
Stewart Paul
John E. Waller
Assignee (at issue)
Dearborn Chemical Company Limited
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.