...
<ref>
 <element-citation publication-type="patent">
  <person-group person-group-type="inventor">
   <name><surname>Cho</surname>
    <given-names>ST</given-names></name>
  </person-group>
  <collab collab-type="assignee">Hospira, Inc.</collab>
  <source>Microneedles for minimally invasive
   drug delivery</source>
  <patent country="US">United States patent US 
  6,980,855</patent>
  <year iso-8601-date="2005-12-27">2005</year>
  <month>Dec</month>
  <day>27</day>
 </element-citation>
</ref>
...

...
<ref>
 <mixed-citation publication-type="patent">
  <string-name><surname>Cho</surname>
  <given-names>ST</given-names></string-name>, inventor;
  <collab>Hospira, Inc.</collab>, assignee.
  <source>Microneedles for minimally invasive
  drug delivery</source>. <patent country="US">United States
  patent US 6,980,855</patent>.
  <year iso-8601-date="2005-12-27">2005</year> 
  <month>Dec</month> <day>27</day>.</mixed-citation>
</ref>
...