Bibliographic patent data sources

As previously mentioned, many patent offices publish their bibliographic patent data in XML format in accordance with WIPO standard ST.36.  Where can you find the data?  As of the date of this post, the following web pages provide download links or purchase order information for such data.

• USPTO Patent Grant Bibliographic Data (1976-present)
• Google USPTO Bulk Downloads: US Patents
• Canadian Intellectual Property Office IP Data Products: Patents 
• European Patent Office: Bibliographic Data files
• World Intellectual Property Organization: PCT Bibliographic data
• IP Australia bulk data products 
• State Intellectual Property Office of the P.R.C.: Chinese Patent Data (English machine translation) 
• Korea Intellectual Property Rights Information Service (KIPRIS) Electronic Data Supply
• German Patent and Trade Mark Office (DPMA) data supply services
• Intellectual Property Office of New Zealand

Note that the data may not be free.  The USPTO makes its data available free of charge, with no usage restrictions.  The CIPO also makes its data available free of charge, but only for non-commercial use.  Each patent office may impose different pricing and/or usage constraints on its data.