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The patent EP2520159 was granted to Cedar Spring on Nov 25, 2020. The application was filed on Mar 26, 2012 under application number EP12002101A. The patent is currently recorded with a legal status of "Patent Maintained As Amended".

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 | Opposition Status |
|---|---|---|---|
| COENEGRACHTS SUBSTRAAT | Jul 17, 2018 | PATENTWERK | INTERVENTION ADMISSIBLE |
| CNC HOLDING | May 16, 2017 | ALGEMEEN OCTROOI EN MERKENBUREAU | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE3830289 |
| DESCRIPTION | EP1767086 |
| OPPOSITION | CN1283599 |
| OPPOSITION | DE19702674 |
| OPPOSITION | DE3830289 |
| OPPOSITION | EP0085928 |
| OPPOSITION | EP1767086 |
| OPPOSITION | JP2002034492 |
| OPPOSITION | JPH03280812 |
| OPPOSITION | US2621492 |
| OPPOSITION | US2786342 |
| OPPOSITION | US2913883 |
| OPPOSITION | US3828470 |
| OPPOSITION | US4061483 |
| OPPOSITION | US5421138 |
| OPPOSITION | US5934012 |
| OPPOSITION | US5992169 |
| OPPOSITION | WO02057143 |
| OPPOSITION | WO2009037514 |
| OPPOSITION | WO9204256 |
| OPPOSITION | WO9304948 |
| OPPOSITION | WO9304949 |
| OTHER | DE3830289 |
| OTHER | EP1767086 |
| OTHER | US2621492 |
| SEARCH | BE904994 |
| SEARCH | GB2317898 |
| SEARCH | HUP9800638 |
| SEARCH | IES72947 |
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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Amended description with annotations
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Description
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French translation of claims
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Annex to the communication
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Communication from the Examining Division
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Communication from the Examining Division
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Consultation by telephone/in person
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Sep 25, 2014
Communication from the Examining Division
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Letter accompanying subsequently filed items
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Communication from the Examining Division
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Mar 18, 2013
Refund of fees
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Mar 26, 2012
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Request for grant of a European patent
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