Patent No. EP2571269 (titled "Image-Filtering Method And Apparatus, And Encoding/Decoding Method And Apparatus Using Same") was filed by SK Telecom on May 12, 2011. The application was issued on Sep 25, 2019.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| BUNGARTZ CHRISTOPHERSEN | Aug 2, 2017 | GULDE & PARTNER |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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