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<p>Patent Maintenance Fee Schedule:</p>
<p> Maintenance Fee</p><p>Fees Maintenance fees need to be paid 3.5 ~4, 7.5 ~8, and 11.5 ~12 years after grant</p>
<p>After some time, t, patents are valid from the grant date to 20 years after the application date.</p>
<p>Before t, patents are valid from the application date to 18 years before the grant date.</p>
<p><strong>I don&rsquo;t know what happens when people don&rsquo;t pay maintenance fees.</strong></p>
<p>There is enough information in the <strong>patent </strong>&nbsp;and <strong>feestatus </strong>table to create a <strong>patentStartdateEnddate</strong> table.</p>
<p>Table we want to make:</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Table "public.patentstartdateenddate"</p>


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