Abstract: A shingle is provided having a headlap section and a buttlap section with at least one portion of the buttlap section having a relatively uniform color and/or value and an adjacent portion of the buttlap section having a value gradation from light to dark. A plurality of horizontal striations with transition stripes disposed between adjacent horizontal striations may be used to establish the desired value gradation. An illusion of depth or thickness is created on the portion of the buttlap section having the value gradation. The buttlap section defines in part the exposed weather surface of the associated shingle. The relatively uniform color and/or value portions may be formed on tabs or dragon teeth and the value gradation formed on a backer sheet disposed beneath the tabs. Openings between adjacent tabs expose the associated enhanced value gradation to view.

Abstract: A system for the continuous dielectrophoretic separation of mixtures of particulate and granular materials by passing the materials through a divergent electric field created in a fluid dielectric medium by applying a voltage to an electrode configuration including a rotatable cylindrical-shaped electrode having a non-uniform conductor surface and a stationary perforate electrode spaced therefrom to define a contact zone. The particles having dielectric constants lower than that of the fluid medium are collected through the perforate electrode while those particles having dielectric constants higher than that of the fluid medium are attached to and separated by the rotatable electrode.