With 58,990 PCT applications filed last year, China overtook the US, which filed 57,840 applications that year, as the biggest user of the PCT system. The top position has been held by the US since the PCT system began in 1978.
In 2019, the top five users of the PCT system were China, the US, Japan, Germany and South Korea. For the third consecutive year, China-based telecoms giant Huawei, with 4,411 published PCT applications, was the top corporate filer in 2019. It was followed by Mitsubishi Electric of Japan, Samsung Electronics of South Korea, Qualcomm of the US and Guangdong OPPO Mobile Telecommunications of China.
http://english.cnipa.gov.cn/news/iprspecial/1147325.htm
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