Patent No. EP3100991 (titled "Method Of Preparing A Hydrothermally Cured Pore Or Foam Concrete Mould") was filed by Xella Baustoffe on May 20, 2014. The application was issued on Sep 13, 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 |
|---|---|---|
| BUNDESVERBAND PORENBETONINDUSTRIE EV | Jun 13, 2018 | WISCHMEYER |
| HH DEUTSCHLAND | Jun 13, 2018 | RAFFAY & FLECK |
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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