<span class="citations"><p>Jivn-Ren Chen, Dimitri C. Papadimitriou, "Stable dosage of levothyroxine sodium and process of production." U.S. Patent US5225204, issued November, 1991.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5225204&amp;tbm=pts" rel="noopener" target="_blank">US5225204</a>