Greenhorne, R., U.S. Patent 1,135,684, April 13, 1915
Process for Removing Scale from Incrusted Surfaces
(Perhaps the first example of foamed cleaning)

Brenner, J.W., U.S. Patent 3,037,887, June 5, 1962
Foam Cleaning of Surfaces
(Industrial vessel cleaning)

Crowe, C.W., U.S. Patent 3,436,262, April 1, 1969
Cleaning by Foam Contact and Foam Regeneration Method
(Industrial vessel cleaning)

Simmons, B.G., U.S. Patent 4,133,773, January 9, 1979
Apparatus for Making Foamed Cleaning Solutions and Method of Operation
(Industrial vessel cleaning)

Banks, W.P., U.S. Patent 4,238,244, December 9, 1980
Method of Removing Deposits from Surfaces with a Gas Agitated Cleaning Liquid
(Industrial vessel cleaning)

Bender, H., U.S. Patent 4,266,982, May 12, 1981
Method and Apparatus for Cleaning a Matrix of a Wet Magnetic Separator
(Nuclear plant application)

Sakurai, M., U.S. Patent 4,806,277, February 21, 1989
Decontaminating Solid Surfaces
(Nuclear plant application)

Simmons, B.G., U.S. Patent 4,849,027, July 18, 1989
Method for Recycling Foamed Solvents
(Industrial vessel cleaning)

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