What does the USPTO's rejection of Nintendo's Summon and Fight Patent mean for PalWorld and other games?

In an important – if not yet truly decisive – ongoing Nintendo vs. development. PalWorld Saga, the United States Patent and Trademark Office (USPTO) has issued a final rejection of the 'summon and fight' patent granted to Nintendo in September 2025. The patent, which covered a game mechanic that involved summoning a secondary character into battle, almost came under fire from the gaming industry. Now, a USPTO examiner has initially agreed with the critics and moved its pre-approval, which is a meaningful step. PalWorldgrace of

This isn't a knockout blow for several reasons: the patent isn't in the same courts as the actual legal battle, it's one of several patents involved, and Nintendo retains the right to respond, amend, and appeal. But the decision confirms the widespread concern of many legal experts and observers that patents were granted too broadly and with too little scrutiny. The jury is still out, but that sweeping development could help change the tone of the overall case.

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What the patent actually covers

To know what this rejection really means PalWorld And games like this, it's important to open it up, because the formal title of the patent (Patent US12403397B2) – “Storage medium, information processing system, information processing device, and game processing method” – doesn't say much, and everything involved in this case is a confusing mix of legalese in two different languages. The heart of the Nintendo patent's original claim is more straightforward: it covers specific technical implementations in a game that allow the player to summon a companion creature (the patent calls it a “sub-character”) which then engages an enemy, via one of two different modes:

Manual Mode: If an enemy is already present at the summoning location, the battle moves forward under player control.
Automatic Mode: If an enemy is not immediately nearby, the sub-character moves in a player-specified direction and automatically initiates battle if it encounters one.

It's intentionally vague, but in plain terms, it can apply to essentially any game where a fellow creature is thrown out, and then fights something. The problem with this is that many IP law experts have raised concerns that the claim's vague language makes it applicable to a broad spectrum of Nintendo's patented video games. PalWorld Perhaps the most obvious example, but games like Alden Ring Can technically fall into the same range if enough pressure is applied, legally speaking.

How did Nintendo get to this point?

For reference, Nintendo filed this application in March 2023, and it was granted in September 2025 with a cleaner than average prosecution history: the claims were never rejected or modified during the initial examination, a result that practitioners call unusual. Industry observers quickly flagged the extensive prior art on forums and Reddit — games that had been doing this kind of thing for decades — and legal commentators were blunt in their criticism. Patent analyst Florian Müller called the case “a clear case of intimidation” on a large scale.

The volume of criticism was so loud that in November 2025, the USPTO Director ordered an ex parte reexamination (in the absence of a party) of the patent, and by March 2026, the examiner issued a 104-page Office Action rejecting all 26 claims made in the patent. The rejection combined four prior art references — from Konami, Bandai Namco, and Nintendo — to make a case for clarity itself. Obviousness in this case is a legal basis that prevents patenting of inventions that would have been obvious to a person of ordinary skill in the art at the time of filing.

What exactly is a “non-final”?

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Although this rejection appears to be a landmark ruling on its face, a non-final rejection is, essentially, a first draft of a decision. Nintendo has two months (at least) to respond and make amends, but the practical trade-off Nintendo faced with this rejection is real. Amending claims to avoid rejection means sacrificing the broad scope that made the patent so controversial and so meaningful in the expansion fight against it. PalWorld Developer Pocketpair in the first place.

The Bigger Picture: Japan and Nintendo's US Portfolio

To be clear, immediately PalWorld The lawsuit is a Japanese lawsuit, filed in September 2024 in the Tokyo District Court. All this USPTO business has no direct legal meaning in that proceeding, but the direct connection to the case in Japan is not the point. Nintendo's problem with the UPTSO stems from proactive steps to build a parallel US patent portfolio, fast-tracking several US patents in late 2024 that match Japanese patents. PalWorld suite. It would set the stage for US litigation if Nintendo chooses to pursue it.

So, while it doesn't affect the actual case, the USPTO's reexamination calls into question the credibility of Nintendo's entire US patent enforcement strategy. Notably because the Japanese Patent Office also issued a separate non-final rejection of a related Japanese application (No. 2024-031879) — the parent of two of the claimed “monster capture” patents — citing games like ARK: Survival Evolved and monster hunter As in the prior art. The JPO rejection isn't immediately binding, but Pocketpair is likely to cite both of these decisions when arguing against Nintendo's case, and judges may notice how two separate patent offices are treating the same underlying mechanics.

What Nintendo's patent rejection means for the industry

In the short term, it's a public relations victory for Pocketpair, a developer that has already actively made changes. PalWorldMechanics after Nintendo filed a Japanese suit, removing the ability to ride friends for gliding and replacing it with a separate device. It provides a public, authoritative source that supports the argument that Nintendo's game-mechanic patents are overly broad and poorly vetted. In the long run, the case may be important to set a tone; A USPTO Director-ordered reexamination ends in the rejection of all claims—based on obviousness—sending a message.

The battle with Pocketpair in Japanese courts remains undecided. For Nintendo in particular, the pressure is now to either defend the claim in writing, which is an uphill battle for the tester's perfection, or accept narrower versions that carry less enforcement weight. The legal battle has already had a real impact on game design, though, depending on how the patent ultimately settles.