Patent No. EP1658852 (titled "Oral Pharmaceutical Preparation Containing Ibandronat") was filed by Roche on Apr 21, 1997. The application was issued on Nov 9, 2016.

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 |
|---|---|---|
| HEXAL | Aug 9, 2017 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
| TEVA PHARMACEUTICAL INDUSTRIES LTD | Aug 9, 2017 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
| AVANSOR PHARMA | Nov 9, 2016 | PRINS |
| G L PHARMA | Nov 9, 2016 | PRINS |
| STADA ARZNEIMITTEL | Nov 9, 2016 | PRINS |
| SYNTHON | Nov 9, 2016 | PRINS |
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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