Patent No. EP3613814 (titled "Writing, Marking And/Or Character Liquid For Capillary Systems, In Particular For Applicators With A Capillary System, And Applicator") was filed by Faber Castell on Aug 22, 2018. The application was issued on Oct 18, 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 |
|---|---|---|
| STAEDTLER MARS | Jul 19, 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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