<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="cfr.xsl"?>
<CFRGRANULE xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="CFRMergedXML.xsd">
  <FDSYS>
    <CFRTITLE>37</CFRTITLE>
    <CFRTITLETEXT>Patents, Trademarks, and Copyrights</CFRTITLETEXT>
    <VOL>1</VOL>
    <DATE>2007-07-01</DATE>
    <ORIGINALDATE>2007-07-01</ORIGINALDATE>
    <COVERONLY>false</COVERONLY>
    <TITLE>Expert testimony; tests and data.</TITLE>
    <GRANULENUM>41.158</GRANULENUM>
    <HEADING>Section 41.158</HEADING>
    <ANCESTORS>
      <PARENT HEADING="Title 37" SEQ="4">Patents, Trademarks, and Copyrights</PARENT>
      <PARENT HEADING="CHAPTER I" SEQ="3">UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE</PARENT>
      <PARENT HEADING="" SEQ="2"/>
      <PARENT HEADING="PART 41" SEQ="1">PRACTICE BEFORE THE BOARD OF PATENT APPEALS AND INTERFERENCES</PARENT>
      <PARENT HEADING="Subpart D" SEQ="0">Contested Cases</PARENT>
    </ANCESTORS>
  </FDSYS>
  <SECTION>
    <SECTNO>§ 41.158</SECTNO>
    <SUBJECT>Expert testimony; tests and data.</SUBJECT>
    <P>(a) Expert testimony that does not disclose the underlying facts or data on which the opinion is based is entitled to little or no weight. Testimony on United States patent law will not be admitted.</P>
    <P>(b) If a party relies on a technical test or data from such a test, the party must provide an affidavit explaining:</P>
    <P>(1) Why the test or data is being used,</P>
    <P>(2) How the test was performed and the data was generated,</P>
    <P>(3) How the data is used to determine a value,</P>
    <P>(4) How the test is regarded in the relevant art, and</P>
    <P>(5) Any other information necessary for the Board to evaluate the test and data.</P>
  </SECTION>
</CFRGRANULE>

