The quiet clause that can sink a patent: The disclosure
Jan 6, 2026
•1 minute read
In this article:
Four European Patent Office appeal cases (T 1026/23 Nestlé, T 1489/23 General Electric, T 1495/23 Daicel, T 1842/23 Wavefront Technology) resulted in patent revocations under Article 83 EPC for insufficient disclosure. Patents failed to provide adequate technical teaching for skilled persons to carry out inventions across claimed scope without undue experimentation. Cases involved neurogenesis compositions, additive manufacturing control, e-cigarette materials, and 3D optical security products. All patents had broad claims but narrow or vague descriptions.
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