TCK Accepted for Silicon Carbide Focus Ring Patent Correction
The Korean Intellectual Property Trial and Appeal Board accepted TCK's correction request on the 7th, narrowing the scope of its SiC focus ring patent claims.
TCK has corrected one of its Silicon Carbide focus ring patents after the Korean Intellectual Property Trial and Appeal Board accepted its correction request on the 7th, according to zdnet.co.kr.
The corrected patent, registration number 2117888, relates to a Silicon Carbide (SiC) structure formed through chemical vapor deposition. The correction narrows the scope of the patent claims.
The request was submitted to the Korean Intellectual Property Trial and Appeal Board, the body that reviews patent validity and correction matters. A corrected patent means the claims are adjusted rather than removed.
Background of the dispute
In 2019, TCK filed a patent infringement lawsuit against DSTechno at the Seoul Central District Court, and in 2020 it filed a similar suit against YMC and Yacom. In November 2023, the patent tribunal ruled that the '888 patent was invalid. The Patent Court revoked that ruling in October 2024 and sent the case back to the patent tribunal. In November 2024, the Seoul Central District Court ruled that YMC and Yacom infringed two of TCK's patents. In July 2025, the patent tribunal ruled that the '888 patent was valid, and TCK concluded its dispute with YMC and Yacom through a mutual agreement that same month. In August 2025, DSTechno filed a lawsuit at the Patent Court to appeal the validity ruling.
Quick answers
What patent did TCK correct?
TCK corrected its Silicon Carbide focus ring patent, registration number 2117888, which covers a SiC structure formed via chemical vapor deposition.
Who accepted the correction request?
The Korean Intellectual Property Trial and Appeal Board accepted the correction request on the 7th.
What does the correction do?
The correction narrows the scope of the patent claims.