Granted Patent
Utility
US 4,338,460 · App. 06/179,805
Process for preparing chelating agents
Inventors:
Roger R. Gaudette, John L. Ohlson, Patricia Scanlon
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Aug 20, 1980
Inventors
Roger R. Gaudette
John L. Ohlson
Patricia Scanlon
Assignee (at issue)
W. R. Grace & Co.
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.