A growth company typically has some sort of competitive advantage (a new product, a breakthrough patent, overseas expansion) that allows it to fend off competitors.
Originally called the outlook envelop, the patent initially anticipated using thin rice paper as the transparent material forming the window, though this material has since been replaced by clear plastics.
Third, the courts and the patent office have rapidly proposed, modified, and deprecated several tests for determining the scope of equivalents of a means-plus-function element.