Patent No. EP3307434 (titled "Stabilized Microporous Crystalline Material, The Method Of Making The Same, And The Use For Selective Catalytic Reduction Of Nox") was filed by PQ on Apr 9, 2015. The application was issued on Jun 9, 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 |
|---|---|---|
| JOHNSON MATTHEY PUBLIC | Mar 9, 2022 | 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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