Granted Patent
Utility
US 5,476,644 · App. 08/227,161
Cyclic triamine chelating agents
Inventors:
Carl R. Illig, Thomas J. Caulfield, John L. Toner, Peng Guo, David L. Ladd
Patented Case
View Patent ↗
Granted: Dec 19, 1995
Filed: Apr 13, 1994
Inventors
Carl R. Illig
Thomas J. Caulfield
John L. Toner
Peng Guo
David L. Ladd
Assignee (at issue)
Sterling Winthrop 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.