*[http://www.patentsview.org/web/ USPTO Visual Database, PatentsView].
*[https://www.google.com/googlebooks/uspto-patents-pair.html#AvailableApplications USPTO PAIR (Patent Application Information Retrieval)]
=References=
<ref name="USPTO report"> [http://www.uspto.gov/sites/default/files/documents/USPTOFY15PAR.pdf] 'United States Patent and Trademark Office Performance and Accountability Report: Fiscal Year 2015', "United States Patent and Trademark Office", (Alexandria, Virginia). </ref>