Patent No. EP3348526 (titled "Coated Article With Silicon Nitride Inclusive Layer Adjacent Glass") was filed by Guardian Europe on Aug 20, 2004. The application was issued on Apr 15, 2020.

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 |
|---|---|---|
| PILKINGTON GROUP | Jan 15, 2021 | MARSH |
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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