Patent No. EP3854987 (titled "Self-Locking Threaded Connection Partially In Non-Locking Engagement") was filed by Nippon Steel on Jan 27, 2020. The application was issued on Aug 2, 2023.

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 |
|---|---|---|
| HYDRIL | May 2, 2024 | BOULT WADE TENNANT |
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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