Trademarks are a headache. Trademarks for foreign countries are even worse. You just found out that a US trademark won’t apply in the UK, and who even knows if they work in the EU (they don’t, by the way).
情報源: Brexit: 8 Frequently asked questions about trademark registration in the UK
こちらの記事もどうぞ
商標登録insideNews: Dennemeyer talks IP: Brexit and trademarks – what is likely to happen 
商標登録insideNews: IPPro The internet | Brexit transitional period to offer ‘cloned’ trademark rights | ipprotheinternet.com 
商標登録insideNews: Supreme Court asked to nullify the Google trademark | Ars Technica 
商標登録insideNews: Brexit Q & A | EUIPO 商標登録insideNews: Brands face Brexit trademark crisis | News | Drapers 商標登録insideNews: Brexit to Begin Transition Period for Brand Owners Seeking UK Trademark Protection | JDSupra 
商標登録insideNews: Foreign Trademark Filers Soon May Need U.S. Lawyer – Big Law Business 
商標登録insideNews: Online Trademark Registration Services Can Be Disastrous | IPWatchdog 
商標登録insideNews: Jaguar Land Rover loses Defender trademark ruling | Business Matters 
商標登録insideNews: South Korea: How do you fast track trademark registration in Korea? | Managing Intellectual Property 
商標登録insideNews: Disputes over geographical indications of wine trademarks | China Business Law Journal 
商標登録insideNews: Trademark Registration about to open in Myanmar: Soft opening – Inventa International