Patent No. EP1666222 (titled "Method Of Manufacturing Thermoplastic Resin Foam Particle") was filed by Sekisui Plastics on Sep 8, 2004. The application was issued on Feb 25, 2015.

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 |
|---|---|---|
| GALA INDUSTRIES | Nov 25, 2015 | THOMA |
| NORDSON | Nov 25, 2015 | EISENFUHR SPEISER |
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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