&gt; I use the patent to sell a product<p>Let&#x27;s say that you are a patent holder for an über-toaster.<p>If some company is making über-toasters using your patent, you can stop them from using your patent for their profit.  This is what patents for.<p>If some other company is buying <i>used</i> über-toasters, fixes them and re-sells them, you should not be able to stop them from re-selling fixed über-toasters.