What is a Kind Code?
"Kind Codes" are the Standard ST.16 codes initiated by the World Intellectual Property Organization (WIPO) to distinguish the kind of patent document and the level of publication. For example, the Kind Code for the first patent application publication is "A1".
For information on Kind Codes included on USPTO patent documents, please see: http://www.uspto.gov/web/menu/announce/kindcodes.pdf.
For detailed information on Standard ST.16, please see http://www.wipo.int/scit/en.