Patent No. EP2730417 (titled "Recording Material Supply System, Circuit Board, Structure, And Ink Cartridge For Recording Material Consumption Device") was filed by Seiko Epson on May 14, 2010. The application was issued on Mar 11, 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 |
|---|---|---|
| CZERWONKA, ALFRED | Jul 29, 2015 | HENKEL |
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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