Exclusive data visualisation: Japanese firm biggest PCT filer


In collaboration with patent analytics company Patent-Pilot, WIPR is delighted to publish a striking ‘chart race’ showing the total number of international patent applications by law firms over the last 40 years.

The results show that since 1988, the title of ‘world’s top filer’ of Patent Cooperation Treaty applications has swapped from Sweden’s AWA and Zacco in the 1990s to US-based Fish & Richardson in the 2000s, before Japan’s Shiga International Patent Office swiftly rises to first place.


The top ten firms to have filed the most patent applications are based in a handful of countries, namely Japan, the US, the UK, Sweden and China.

As of 2018, Shiga International Patent Office has filed more than 19,000 patent applications.

This is closely followed by Fish & Richardson with 17,552 applications and UK-based firm Marks & Clerk, which has filed 14597 applications.

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patent analytics, Patent-Pilot, patent applications, legal firms, PCT, AWA and Zacco, Fish & Richardson, Marks & Clerk, Shiga International Patent Office