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*CPC - as above
*USPC - just a numeric but not split. Is 22431 224/31 or 22/431, etc.
==Fields of Interest==
We only care about Utility patents (and maybe Reissue patents too)
===Utility patent grants fields===
Patent:
patent number
kind
pubdate
<document-id>
<country>US</country>
<doc-number>08925112</doc-number>
<kind>B2</kind>
<date>20150106</date>
</document-id>
