While trademark law resides a bit afar from my usual "sandboxes," a recent paper in this area accompanies the release of a related open-access dataset. In the paper, The Japan Trademarks Dataset: An Open-access Resource, Jeremy Sheff (St. John's) emphasizes how building such datasets, along with making them open-access, "is thus crucial to ensuring the continued progress of our understanding of trademarks and their operation in the world."
To this end, the Japan Trademarks Dataset (link here) includes "all data preserved by the Japan Patent Office on trademark applications, registrations, and administrative proceedings (including data on parties, examiners, prosecution history events, and interactions with the international trademark system) from the inception of Japan’s trademark system in the late 19th century through September 25, 2019."