Patent No. EP3289627 (titled "Method For The Treatment Of Used Batteries, In Particular Rechargeable Batteries, And Battery Processing Installation") was filed by Duesenfeld on Apr 28, 2016. The application was issued on May 20, 2020.

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 |
|---|---|---|
| EKATO SYSTEMS | Feb 16, 2023 | DAUB |
| VOLKSWAGEN | Feb 15, 2021 | - |
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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