Patent No. EP1560975 (titled "Highly Refined Fiber Mass, Process Of Their Manufacture And Products Containing The Fibers") was filed by Fiberstar on Nov 6, 2003. The application was issued on Sep 16, 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 |
|---|---|---|
| UNILEVER UNILEVER | Jun 16, 2016 | VAN BENTHUM |
| HERBSTREITH & FOX KG PEKTIN-FABRIKEN | Jun 15, 2016 | ROTH, SEBASTIAN |
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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