<span class="citations"><p>Takuzo Kamishita, "Gel preparations for topical application of diclofenac sodium." U.S. Patent US4670254, issued October, 1983.</p>
</span><a href="https://www.google.com/?tbm=pts#q=4670254&amp;tbm=pts" rel="noopener" target="_blank">US4670254</a>