Patent No. EP3736221 (titled "Brush Product Packaging Device And Tray Packaging For Holding At Least Two Brush Product Packaging Devices") was filed by Trisa Holding on May 6, 2019. The application was issued on Aug 23, 2023.

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 |
|---|---|---|
| HALEON UK | May 22, 2024 | HOFFMANN EITLE |
| MC SCHIFFER | May 7, 2024 | GRUNECKER PATENT |
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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