Tennant Company

Paul D Dodge

Ferdinand J Herpers, Jr

Harley E Kroll

Alfred D Carlson

The present invention relates to a membrane remover/etchant solution including an organic solvent, a strong ionizable acid, a weak acid and an acid stable surfactant. The present invention further includes a method for removing a membrane and etching a concrete surface in which the membrane remover/etchant solution is in an organic solvent system and is applied to the concrete in an inactive acid form and then water is applied to activate the acid. The resulting materials are then picked up and the surface is rinsed with water.

Membrane remover/etchant

A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.

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Apple Valley, MN, United States of America

Paul D Dodge