Patent No. EP2586788 (titled "Prevention Of Disulfide Bond Reduction During Recombinant Production Of Polypeptides") was filed by Genentech on Jul 8, 2008. The application was issued on Nov 29, 2017.

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 |
|---|---|---|
| BAYER | Aug 29, 2018 | VIERING |
| DF MP DORRIES FRANK MOLNIA & POHLMAN PATENTANWALTE RECHTSANWALTE PARG MBB | Aug 29, 2018 | EDER |
| MAIWALD | Aug 29, 2018 | MAIWALD |
| MERCK SHARP & DOHME | Aug 29, 2018 | CARPMAELS & RANSFORD |
| OETKE | Aug 29, 2018 | WALLINGER RICKER SCHLOTTER TOSTMANN |
| UCB BIOPHARMA | Aug 29, 2018 | UCB |
| GLAXO GROUP | Aug 27, 2018 | BHOGAL |
| GRUNECKER PATENT UND RECHTSANWALTE PARTG MBB | Aug 27, 2018 | GRUNECKER |
| GRUNECKER PATENT UND RECHTSANWALTE PARTG MBB | Aug 27, 2018 | GRUNECKER PATENT |
| MICHALSKI HUTTERMANN & PARTNER PATENTANWALTE MBB | Aug 24, 2018 | - |
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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