The use of an electro-sensitive movable fluid, that is, a micromotor, a linear motor, a micropump and a method of using the micropump, a microactuator, and an apparatus which these devices are applied to, and a method and apparatus of controlling flow properties of a fluid....http://www.google.com/patents/US6530217?utm_source=gb-gplus-sharePatent US6530217 - Micromotors, linear motors and microactuators for controlling flow properties of fluids
