Who are the lead inventors on the patent?

The lead inventors are Erika Varis Doggett, Fabian Jonas Landwehr, and Romann Matthew Weber.

What is the 'forgetting formula' in the patent?

The patent includes a mathematical formula where each memory has a stability value and a decay constant, and a retention score determines if the character can still recall it. Memories from trusted sources resist forgetting, while casual ones fade faster if not accessed.

Can the virtual characters start conversations on their own?

Yes, the patent describes a 'trigger' function that lets the character initiate conversation after user inactivity, bringing up unfinished topics or asking follow-up questions.

Large Language ModelsRoboticsTop Companies' AI MovesAI Business & IndustryTop Companies AIAug 25, 2026Aug 26, 2026, 06:32 JST

Disney patents AI memory tech for robot characters

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3 Key Points

What happened
Disney and ETH Zürich were granted patent US 12,718,481 B2 on August 25, 2026, for AI virtual characters with a working memory. The system pulls from stored memories before generating responses to reduce hallucinations.
Why it matters
Current chatbot-style characters can say things that don't match their personality or backstory. This patent describes a memory bank that ranks memories by relevance, recency, and importance, plus a formula for forgetting—characters could hold onto conversation details instead of resetting each time.
What to watch
The patent covers chatbots, virtual world characters, and interactive robots in real-world settings like theme parks, stores, and homes. Disney has already introduced interactive walk-around Olaf at Disneyland Paris and Star Wars BDX droids at several parks, suggesting where this tech could be applied next.

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Context & Analysis

This patent builds on Disney's recent park deployments, such as the interactive walk-around Olaf at Disneyland Paris and Star Wars BDX droids at several parks. The memory system addresses a known flaw in current AI characters: they 'hallucinate' or say things inconsistent with their backstory, which could break the immersive experience. By grounding responses in a retrievable memory bank, the characters could maintain coherent personalities over extended interactions.

The patent also introduces a quantitative approach to memory decay, with stability values and decay constants, meaning not all memories persist equally. This could allow Disney to program characters that remember important guest preferences while letting trivial details fade, mimicking human memory. The filing with ETH Zürich suggests a research partnership, and the 'trigger' function opens the door to proactive engagement, making characters feel more alive.

While the patent is a legal document, its broad claims cover chatbots, virtual worlds, and physical robots, indicating Disney's ambition spans digital and physical experiences. The technology is still in patent stage, so deployment timelines remain uncertain, but it signals where Disney's park robotics and interactive media could be headed next.

FAQ

Who are the lead inventors on the patent?: The lead inventors are Erika Varis Doggett, Fabian Jonas Landwehr, and Romann Matthew Weber.
What is the 'forgetting formula' in the patent?: The patent includes a mathematical formula where each memory has a stability value and a decay constant, and a retention score determines if the character can still recall it. Memories from trusted sources resist forgetting, while casual ones fade faster if not accessed.
Can the virtual characters start conversations on their own?: Yes, the patent describes a 'trigger' function that lets the character initiate conversation after user inactivity, bringing up unfinished topics or asking follow-up questions.

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