Patent No. EP3511358 (titled "Polyester Terephthalate-Co-Sebate Resin And Preparation Method Therefor") was filed by Kingfa SCI & Tech on Sep 4, 2017. The application was issued on Jan 27, 2021.

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 |
|---|---|---|
| BASF | Oct 26, 2021 | MEISSNER BOLTE PARTNERSCHAFT MBB |
| NOVAMONT | Oct 26, 2021 | MAIWALD |
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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