Patent No. EP2369243 (titled "Method For Heating Drinking Water, Building Technology System, Domestic Station And Building") was filed by Delta Systemtechnik on Mar 25, 2011. The application was issued on Jul 11, 2018.

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 |
|---|---|---|
| STIEBEL ELTRON | Nov 20, 2020 | EISENFUHR SPEISER |
| MEIBES SYSTEM TECHNIK | Apr 11, 2019 | KAILUWEIT & UHLEMANN PATENTANWALTE PARTNERSCHAFT MBB |
| GERDES HOLDING | Apr 11, 2019 | STORK BAMBERGER PATENTANWALTE PARTMBB |
| ROBERT BOSCH | Apr 3, 2019 | - |
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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