<span class="citations"><p>Daniel Aubert, Francis Blanc, Henri Desmolin, Michel Morre, Lucette Sindely, "Valproic acid preparations." U.S. Patent US5017613, issued January, 1965.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5017613&amp;tbm=pts" rel="noopener" target="_blank">US5017613</a>