The Foam Book
Aqueous Foam Technology References
The Aqueous Foam Technology Book
Folk, S.H., U.S. Patent 4,413,859, November 8, 1983.
Mining Sulphur with Foam Barrier
Comment - a clever use of foam, but the chosen composition was not up to the task. Frasch sulfur mining has been restricted to only a single company, Freeport McMoRan, but recent corporate conversions make development of this technology difficult.
UPDATED, 01/06/10 10:29 AM