Sony Interactive Entertainment has registered “PS6,” PS7,” “PS8,” “PS9,” and “PS10” trademarks in Japan. Probably, it was made as security for future PlayStation platforms.
This sort of trademark security is a regular case for Sony. Here is a history of “PS” trademarks in Japan:
- PS (trademarked in 2000, released in 1994)
- PS2 (trademarked in 1999, released in 2000)
- PS3 (trademarked in 2005, released in 2006)
- PS4 (trademarked in 2006, released in 2013)
- PS5 (trademarked in 2006, will be released in 2020)
Source: gematsu.com
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