Patent No. EP3565503 (titled "Brush Head For Electric Toothbrush") was filed by Harria Investment Group on Mar 22, 2017. The application was issued on Nov 10, 2021.

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 |
|---|---|---|
| ZIEGLER | Nov 10, 2021 | K PATENTANWALTE BLASBERG KEWITZ & REICHEL |
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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