Henry Billings Brown,
Washburn Moen Manufacturing Company v…
“ Under such circumstances courts have not been reluctant to sustain a patent to the man who has taken the final step which has turned a failure into a success. In the law of patents it is the last step that wins. It may be strange that, considering the important results obtained by Kelly in his patent, it did not occur to him to substitute a coiled wire in place of the diamond-shaped prong; but evidently it did not; and to the man to whom it did, ought not to be denied the quality of inventor. ”
