Granted Patent
Utility
US 6,409,799 · App. 09/443,593
Copper leach process aids
Inventors:
Ricardo Arancibia Cifuentes, Donald Carroll Roe, Jorge Vergara Chavez, Andres Reghezza Inzunza
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Nov 19, 1999
Inventors
Ricardo Arancibia Cifuentes
Donald Carroll Roe
Jorge Vergara Chavez
Andres Reghezza Inzunza
Assignee (at issue)
Betzdearborn Inc. & Corporacion Nacional del Cobre de Chile
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.