Changes

Also in the paper, they mentioned the Assignments on the Web for Patents (AOTW-P), a searchable database of individual USPTO assignment records keyed on reel-frame identification, patent number, and assignor or assignee name (https://assignment.uspto.gov/patent/index.html#/patent/search). Obviously it would not be possible to individually use this tool to query all the patent numbers, but if it would be possible to write a script to somehow query each patent number using the rf_id and parse the response, this could potentially be useful to check the patent numbers, but might not be any more accurate than what will already be in DOCUMENT_INFO.

Based on Oliver's script which searched all xpaths and compared which were unique to particular types, we see that the following attributes are unique to each type of patents other than utility patents. These attributes vary by the XML version, which changed over time. Therefore, the lists below are a superset of the attributes that are unique to each of the patents types listed below across all XML versions.

** Address

* US Provisional Application Status (XML41)