Granted Patent
Utility
US 4,337,149 · App. 06/262,417
Promoters for use in the anionic circuit of froth flotation of mineral ores
Inventor:
Saul J. Escalera
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: May 11, 1981
Inventor
Saul J. Escalera
Assignee (at issue)
Sherex Chemical Co., 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.