Sierra Applied Sciences works through simple design and innovative concepts to provide customers with reliable cathodes for a variety of systems. We have achieved greater than 45% target utilization by employing our patented design (U.S. Pat. #5,262,028). When Sierra cathodes are installed in existing customer chambers, customers experience the performance improvements we promise, and guarantee. Simplicity Sierra focuses on simple mechanics and elegance of design, to improve reliability providing the greatest ease of use. Options A broad variety of options offer versatility in cathode mounting and target styles for Sierra's customers. Compatibility Sierra's patented designs provide customers with cathodes that will always meet their needs.