An abbreviation or code that names a country. This is information that can be used to identify a country that granted a patent or to provide a machine-comparable form of the name of a country as an addition to the content of the <country> element.
Best Practice: Although this attribute is optional and open to any value, for Best Practice, the country code should be provided whenever it is known, and the ISO 3166-1 2-letter alphabetic codes should be used, for example:
The complete list is available from ISO, in HTML, text-file, and XML-file versions at the following location: https://www.iso.org/obp/ui/#search.Choose the country code button and search using the search icon.
Used on Elements: <country>, <funding-source>, <patent>
|Text, numbers, or special characters||An abbreviation for a country, typically using the ISO 3166-1 two-letter alphabetic codes, for example, “US” for the United States of America.|
|Restriction||This is an optional attribute; there is no default.|
... <mixed-citation publication-type="patent" publication-format="print" ><person-group person-group-type="inventor" ><string-name><surname>Goss</surname>, <given-names>K.</given-names></string-name></person-group>, “<article-title>Cryptographic Method and Apparatus for Public Key Exchange with Authentications</article-title>,” <patent country="US">U.S, Patent no. 4, 956,863</patent>, <month>Sept.</month> <day>11</day>, <year>1990</year>.</mixed-citation> ...