Patent No. EP3690069 (titled "Free-Cutting Lead-Free Copper Alloy To Which Lead And Bismuth Are Not Added") was filed by Poongsan on Jun 4, 2019. The application was issued on Aug 27, 2025.

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 |
|---|---|---|
| OTTO FUCHS KOMMANDITGESELLSCHAFT | Oct 23, 2023 | HAVERKAMP PATENTANWALTE PARTG MBB |
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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