Case T-302/17: Judgment of the General Court of 29 May 2018 — Sata v EUIPO — Zhejiang Rongpeng Air Tools (6000) (EU trade mark — Invalidity proceedings — EU word mark 6000 — Absolute ground for refusal — Descriptive character — Article 52(1)(a) and (b) of Regulation (EC) No 207/2009 (now Article 59(1)(a) and (b) of Regulation (EU) 2017/1001) — Article 7(1)(c) of Regulation No 207/2009 (now Article 7(1)(c) of Regulation 2017/1001) — Equal treatment — Principle of sound administration — Obligation to state reasons)