Accordingly, the purpose of this Comment is twofold: first, to bring the reader up-to-date on the doctrine of equivalents, and second, to suggest an improvement on the doctrine's application that is consistent with recent developments. This Comment proposes that the hypothetical technique should be expanded to evaluate more than prior art alone. Before exploring how this new use of the hypothetical would work, however, it is necessary to explain the doctrine of equivalents' history, the factors that affect the range of equivalents, and the methods to determine and apply equivalents.
Brian E. Lewis, Expanding the Use of Hypothetical Analysis When Evaluating Patent Infringement Under the Doctrine of Equivalents, 16 SEATTLE U. L. REV. 1409 (1993).