Patent No. EP3551420 (titled "Method And Device For Visualizing Or Evaluating A Process State") was filed by Engel Austria on Feb 28, 2019. The application was issued on Jan 13, 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 |
|---|---|---|
| ARBURG | Oct 13, 2021 | RPK PATENANWALTE REINHARDT UND KAUFMANN PARTNERSCHAFT MBB PFORZHEIM |
| SUMITOMO SHI DEMAG PLASTICS MACHINERY | Oct 13, 2021 | RAU |
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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