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| (Source: Taeshin Inpack) |
Taeshin Inpack, a South Korean printing company, has failed in its attempt to amend the claims of its Korean patent titled "Metallic Paper Expressing such as Feeling of Liquid Metal and Printing Method thereof" (Patent No. 2669821).
In a decision issued May 26, 2025, the Korean Intellectual Property Trial and Appeal Board (KIPTAB) rejected the company's request to amend claim 1 of the patent, filed in January 2025. Taeshin Inpack may challenge the decision by filing a cancellation suit with the Korean Patent Court.
The outcome further complicates the company's position, as the same patent was already invalidated in December 2024. In that earlier ruling, KIPTAB sided with Duksu Industrial, which had filed an invalidation trial against claims 1 and 2 of the patent on grounds of lack of inventiveness. Since the patent includes only two claims, the Board deemed the entire patent invalid. Taeshin Inpack responded by filing an appeal with the Patent Court in January 2025.
The disputed patent covers a printing method that creates a "liquid metal" effect on paper—designed to produce metallic luster that changes with light and viewing angle, all in a single low-cost printing process. The technique combines foil transfer and color printing in one step, eliminating the need for separate foil stamping.
The patent challenged by Duksu Industrial is the only one involving a dispute between the two companies. However, Taeshin Inpack has previously defended a similar patent (Patent No. 1638374) against Heidelberg Korea. In 2017, Heidelberg Korea filed an invalidation trial against the patent, but KIPTAB upheld its validity, and the Patent Court later affirmed the Board's decision.
By PatenTrip
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