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The patent EP2554168 was granted to Astellas Pharma on Jan 24, 2018. The application was filed on Mar 28, 2011 under application number EP11762748A. The patent is currently recorded with a legal status of "Revoked".

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 |
|---|---|---|---|
| ALFRED E TIEFENBACHER | Oct 24, 2018 | HAMM & WITTKOPP | - |
| HEXAL | Oct 24, 2018 | BEST | - |
| LEDERER & KELLER PATENTANWALTE PARTNERSCHAFT MBB | Oct 24, 2018 | KALHAMMER | - |
| STADA ARZNEIMITTEL | Oct 24, 2018 | KERNEBECK | - |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | JP2005162736 |
| DESCRIPTION | JP2005162737 |
| DESCRIPTION | JP2832248B |
| DESCRIPTION | US3133132 |
| DESCRIPTION | US3173876 |
| DESCRIPTION | US3276586 |
| DESCRIPTION | US3541005 |
| DESCRIPTION | US3541006 |
| DESCRIPTION | US3546142 |
| DESCRIPTION | US3845770 |
| DESCRIPTION | US3865108 |
| DESCRIPTION | US3916899 |
| DESCRIPTION | US3995631 |
| DESCRIPTION | US4002173 |
| DESCRIPTION | US4008719 |
| DESCRIPTION | US4077407 |
| DESCRIPTION | US4088864 |
| DESCRIPTION | US4111202 |
| DESCRIPTION | US4160020 |
| DESCRIPTION | US4207893 |
| DESCRIPTION | US4327725 |
| DESCRIPTION | US4519801 |
| DESCRIPTION | US4578075 |
| DESCRIPTION | US4681583 |
| DESCRIPTION | US4839177 |
| DESCRIPTION | US4994276 |
| DESCRIPTION | US5007790 |
| DESCRIPTION | US5019397 |
| DESCRIPTION | US5128143 |
| DESCRIPTION | US5135757 |
| DESCRIPTION | US5156850 |
| DESCRIPTION | US5422123 |
| DESCRIPTION | US5582837 |
| DESCRIPTION | US5780057 |
| DESCRIPTION | US5972389 |
| DESCRIPTION | US6149940 |
| DESCRIPTION | US6340475 |
| DESCRIPTION | WO2004041276 |
| DESCRIPTION | WO9316686 |
| DESCRIPTION | WO9406414 |
| DESCRIPTION | WO9920607 |
| INTERNATIONAL-SEARCH-REPORT | JP2005162736 |
| INTERNATIONAL-SEARCH-REPORT | JP2005162737 |
| INTERNATIONAL-SEARCH-REPORT | JP2008532953 |
| INTERNATIONAL-SEARCH-REPORT | WO2004041276 |
| INTERNATIONAL-SEARCH-REPORT | WO2008084698 |
| INTERNATIONAL-SEARCH-REPORT | WO2010038690 |
| INTERNATIONAL-SEARCH-REPORT | WO9406414 |
| OPPOSITION | EP0661045 |
| OPPOSITION | EP1205190 |
| OPPOSITION | EP1529526 |
| OPPOSITION | EP1559427 |
| OPPOSITION | EP1568361 |
| OPPOSITION | EP2119442 |
| OPPOSITION | EP2345410 |
| OPPOSITION | US2005100602 |
| OPPOSITION | US2005287185 |
| OPPOSITION | US5681582 |
| OPPOSITION | US6368628 |
| OPPOSITION | WO2009019599 |
| OPPOSITION | WO2009052353 |
| OPPOSITION | WO2010038690 |
| OTHER | EP1205190 |
| OTHER | EP1559427 |
| OTHER | EP2345410 |
| OTHER | WO2010038690 |
| SEARCH | EP1440969 |
| SEARCH | EP1559427 |
| SEARCH | US6346532 |
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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European search opinion
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Supplementary European search report
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Search started
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Submission concerning representation
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