Abstract: A dry ice blasting system adapted for low gas flow rates at low pressures with small dry ice particles to produce a very small footprint on a surface being cleaned.

Abstract: A dry ice blasting system adapted for low gas flow rates at low pressures with small dry ice particles to produce a very small footprint on a surface being cleaned.

Abstract: A display mechanism is described having the capability of showing two or more colors using one or more flexible membranes that electrostatically switch positions between stationary electrodes of different geometry and color. Each flexible colored membrane is multi-layered and comprised of at least one conductive layer and one dielectric layer. Each membrane or stack of membranes with the adjacent electrodes serves as a single chromatophore, the color of which is altered electrically. A first colored electrode is substantially flat and parallel to a base substrate containing control circuitry. Each of a plurality of second electrodes is of a substantially rounded geometry, around which membranes wrap as determined by electronic signal. Display color is produced as electric forces separate surfaces of common color. The display is non-luminous, consumes very little power and is easily visible under normal to very bright ambient illumination. Integrated electronics provide power, signal and connectivity.

Abstract: Disclosed is an improved pelletizer and delivery system for hygroscopic and deliquescent materials, pellets being formed by a rotary extrusion mechanism that receives the material in the form of snow from a snow chamber, the system having a pair of scraper members for preventing undesired snow build-up on inside walls of the snow chamber, the scraper members operating in a scissors manner for preventing snow build-up on the scraper members. Carbon dioxide gas from the snow chamber can be used for pressurizing a pellet collector that is located under the extrusion mechanism for smoothly and gently feeding the pellets at least 15 feet horizontally to a receiving hopper, the gas pressure within the collector also enabling delivery of the pellets several feet above the bottom of the collector. The pellets can be delivered in excess of 150 feet horizontally from the collector.

Abstract: A system (10) for delivering a cold particulate material (14) has a closed storage hopper (12) for the material, the hopper having a bottom hopper outlet (16); a venturi feeder (22) having a material inlet (20) for feeding the material, a material conduit (26) to a remote nozzle (30), and a gas inlet (24); a hopper passage (18) connecting the hopper outlet to the feeder material inlet; a gas feed valve (33), the gas feed valve being openable in response to a feed signal (40) for activating the feeder and a blast conduit to the nozzle; a heater (50) in the blast conduit for limiting cooling of a workpiece without adversely heating the material; and a comminutor (52) in the material line proximate the nozzle for delivery of the material at reduced particle size to the nozzle for increased blasting effectiveness.