The Ross Interfacial Surface Generator (ISG) is a patented static mixer designed for laminar flow processes such as blending a minor component into a viscous stream. Despite having very different viscosities or densities, fluids entering the mixer are reportedly combined and subdivided into layers until a homogenous mixture is achieved. Starting with two input streams entering the mixer, over two million layers emerge after just 10 elements.

Each ISG element consists of four passageways set at oblique angles. Material near the periphery (i.e., near the pipe wall) on the inlet side of the element emerges near the center on the outlet side. This radial mixing can reportedly eliminate the wall smearing effect encountered in other static mixer devices.