Patent No. EP2613780 (titled "Methods For Concomitant Treatment Of Theophylline And Febuxostat") was filed by Takeda Pharmaceuticals USA on Sep 8, 2011. The application was issued on Nov 12, 2014.

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 |
|---|---|---|
| DR REDDYS LABORATORIES UK BETAPHARM ARZNEIMITTEL | Aug 12, 2015 | LEDERER & KELLER PATENTANWALTE PARTNERSCHAFT MBB |
| FRKELLY | Aug 12, 2015 | FRKELLY |
| ACTAVIS PTC EHF | Aug 11, 2015 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB |
| STADA ARZNEIMITTEL | Aug 11, 2015 | KERNEBECK |
| STRAWMAN | Aug 11, 2015 | MURRAY |
| ALFRED E TIEFENBACHER | Aug 4, 2015 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
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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