Granted Patent
Utility
US 6,736,877 · App. 09/990,339
Heap bioleaching process for the extraction of zinc
Inventors:
Juris R. Harlamovs, Daniel W. Ashman, Jose Alberto Gonzalez Dominguez, Hector M. Lizama, Dilipkumar D. Makwana, Andrew W. Stradling
Patented Case
View Patent ↗
Granted: May 18, 2004
Filed: Nov 23, 2001
Inventors
Juris R. Harlamovs
Daniel W. Ashman
Jose Alberto Gonzalez Dominguez
Hector M. Lizama
Dilipkumar D. Makwana
Andrew W. Stradling
Assignee (at issue)
Teck Cominco Metals Ltd.
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.