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Japan Patent Office Rejects Key Nintendo ‘Monster Capture’ Patent in Palworld Dispute

The ruling gives Pocketpair new leverage ahead of Nintendo’s 60‑day window to respond.

Overview

  • Application 2024-031879 was rejected for lacking an inventive step, with examiners citing prior games including ARK: Survival Evolved, Monster Hunter 4, Craftopia, Kantai Collection, and Pokémon GO.
  • The rejected filing descends from Nintendo’s 2023 patent JP7505852 and sits between two granted family members, including JP7545191, that are being asserted in the Tokyo District Court case.
  • Japan Patent Office records show a third‑party prior‑art submission earlier this year that contributed to the rejection.
  • The administrative decision does not decide the Tokyo District Court lawsuit, but it may influence the court’s view of the originality of Nintendo’s claimed systems.
  • Nintendo has 60 days from the October 22 notice to amend the claims, argue against the examiner’s findings, or appeal, a process that could extend into 2026.