Patent No. EP2182336 (titled "Method For Providing Comparative Data For An Energy Evaluation Of A Building") was filed by Metrona Union on Nov 3, 2009. The application was issued on Jan 13, 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 |
|---|---|---|
| ISTA INTERNATIONAL GMBH | Oct 13, 2016 | COHAUSZ HANNIG BORKOWSKI WISSGOTT |
| TECHEM ENERGY SERVICES | Oct 13, 2016 | KEIL & SCHAAFHAUSEN PATENTANWALTE PARTGMBB |
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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