USPTO Rejects Nintendo's Pokémon-Style Summon Patent, Dealing Major Legal Setback

Every indie developer who spent 2025 quietly redesigning a creature-companion combat system was doing it in response to a patent most players never knew existed. U.S. Patent No. 12,433,397, granted in September 2025, claimed ownership over the mechanic of "summoning a sub-character and letting it fight," a description broad enough to cast a legal shadow over turn-based RPGs, monster collectors, and any title where a companion NPC handles combat autonomously. On April 1, a USPTO examiner rejected all 26 claims in a non-final Office Action. The headline sounds definitive. The legal reality, for developers and players alike, is considerably more complicated.

The direct answer to "does this change anything today" is: not yet. A non-final rejection is the USPTO's opening argument, not its verdict. Nintendo has two months to respond, a window it can extend without even providing a reason, and its options include amending claims, submitting new arguments, or appealing to the Patent Trial and Appeal Board and then to the federal courts. The patent technically remains in force throughout. Nothing in anyone's game library changes this week.

What makes the rejection strategically significant is the prior art the examiner reached for. Rather than citing gameplay from Pokémon competitors or dissecting Palworld's mechanics, the examiner dismantled all 26 claims using only four earlier patent applications: Nintendo's own Taura filing, Nintendo's Motokura application from 2022, Konami's Yabe filing, and Bandai Namco's Shimomoto patent from 2020. Combining Taura with either Motokura or Yabe erased 18 of the 26 claims outright. Adding Shimomoto provided what the USPTO called the "missing link" that closed the remaining eight. The examiner never had to load a single game. Two of the four prior art references dismantling the patent belong to Nintendo itself.

That structure matters for what comes next. Florian Mueller of Games Fray, who provided the most detailed public analysis of the ruling, noted the USPTO constructed two alternative rejection theories for each of the 26 claims specifically to reduce the odds of a successful re-appeal. Any narrowed or amended version of the patent now faces a documented prior-art record that Nintendo itself helped create.

For the Palworld lawsuit, the picture is real but limited. The USPTO is a US authority, and its findings carry no direct weight in Nintendo's ongoing Japanese litigation against Pocketpair. What shifts is Nintendo's leverage in any potential US enforcement action: a contested, administratively rejected patent is a significantly weaker threat instrument than an unchallenged one. The fear that '397 could be used to demand licensing fees from American studios, or to force design changes on monster-taming games in active development, loses meaningful force while the patent sits in re-examination limbo.

USPTO director John Squires made the rare call to initiate re-examination in November 2025, just two months after the patent was granted, a signal that the application's breadth had drawn scrutiny at the agency's highest level. IP scholars had flagged the original approval as overreach almost immediately. The rejection now on record, even in non-final form, publicly validates that concern and gives developers documented prior-art references to point to if future enforcement threats emerge.

Whether Nintendo amends, argues, or ultimately abandons the '397 patent, the examiner's analysis will not disappear from the record. For any studio currently building a creature-combat system, that paper trail may prove more durable than the ruling itself.