Patent No. EP1908935 (titled "Holding Seal Member For Exhaust Gas Purifying Body And Method For Manufacturing The Holding Seal Member") was filed by Ibiden on Dec 14, 2006. The application was issued on Oct 29, 2014.

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 |
|---|---|---|
| 3M INNOVATIVE PROPERTIES COMPANY | Jul 10, 2015 | MULLER |
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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