More info I found:
USC 28, part VI, Chp 85
<P class=catchline>Sec. 1338. - Patents, plant variety protection, copyrights, mask works, designs, trademarks, and unfair competition
<DIV class=statute>
<P class=dataText>
<DIV class=divDataText></DIV>
<DIV class=divDataText>
<P class=labelLeader-nohead-1><A name=1338.a><SPAN class=label-1>(a) </SPAN></A>
<P class=labeltext-1>The district courts shall have original jurisdiction of any civil action arising under any Act of Congress relating to patents, plant variety protection, copyrights and trademarks. Such jurisdiction shall be exclusive of the courts of the states in patent, plant variety protection and copyright cases. </DIV>
<DIV class=divDataText>
<P class=labelLeader-nohead-1><A name=1338.b><SPAN class=label-1>(b) </SPAN></A>
<P class=labeltext-1>The district courts shall have original jurisdiction of any civil action asserting a claim of unfair competition when joined with a substantial and related claim under the copyright, patent, plant variety protection or trademark laws. </DIV>
<DIV class=divDataText>
<P class=labelLeader-nohead-1><A name=1338.c><SPAN class=label-1>(c) </SPAN></A>
<P class=labeltext-1>Subsections (a) and (b) apply to exclusive rights in mask works under chapter
9 of title
17, and to exclusive rights in designs under chapter
13 of title
17, to the same extent as such subsections apply to copyrights</DIV>
</DIV>