so, talking about patents and not referring machinery, is a little bit useless

Nano bead mill for repeatable dispersions with high power input

The nano bead mill DISPERMAT® SL-nano is a closed, horizontally operating nano bead mill with a high power input and extremely low clearance volume for circulation and pass procedure. The nano bead mill can be used for wet grinding in laboratory, techniques and the production.

Distinguishing marks of the nano bead mill:

• High grinding stock production due to pneumatic press out system
• Extremely small milling beads from 0.1 – 0.3 mm

http://www.vma-getzmann.com/english/products_for_lab_and_pilot_plant_/bead_mills/bead_mill_dispermat_sl-nano/bead_mill_dispermat_sl-nano_0_935_1722_2492_2511.html