Patent No. EP2391490 (titled "Process For Adding A Coupling Agent To Raw Stock") was filed by UPM Kymmene on Jan 29, 2010. The application was issued on Jul 16, 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 |
|---|---|---|
| SCHMITZ | Apr 16, 2015 | - |
| STORA ENSO OYJ | Apr 16, 2015 | FORSTMEYER |
| REHAU INDUSTRIES | Apr 15, 2015 | - |
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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