Granted Patent
Utility
US 6,080,696 · App. 09/128,593
Method for cleaning fouled ion exchange resins
Inventors:
Hilton Duke, John L. Featherstone, Charles R. Marston
Patented Case
View Patent ↗
Granted: Jun 27, 2000
Filed: Aug 3, 1998
Inventors
Hilton Duke
John L. Featherstone
Charles R. Marston
Assignees (at issue)
Midamerican Energy Holdings Company
THE DOW 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.