''Minerals Separation v. Hyde'', 242 U.S. 261 (1916), is a

United States Supreme Court The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on question ...

case on the patent protection of froth flotation.

Background

Minerals Separation, Limited obtained U.S. Patent No. 835,120, issued on November 6, 1906, to Henry Livingston Sulman, Hugh Fitzalis Kirkpatrick-Picard and John Ballot. As stated in the specification of the patent, the claimed discovery related "to improvements in the process for the concentration of ores, the object being to separate metalliferous matter from

gangue Gangue () is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are di ...

by means of oils, fatty acids, or other substances which have a preferential affinity for such metalliferous matter over gangue." Prior to the discovery, it was well known that oil and oily substances had a selective affinity or attraction for, and would unite mechanically with, the minute particles of metal and metallic compounds found in crushed or powdered ores, but would not so unite with the quartz, or rocky nonmetallic material, called "gangue". It was also well known that this selective property of oils and oily substances was increased when applied to some ores by the addition of a small amount of acid to the ore and water used in process of concentration.

External links

* {{USArticleI United States Supreme Court cases United States Supreme Court cases of the White Court United States patent case law 1916 in United States case law