Patent No. EP3898184 (titled "Heater Arrangements And Apparatus For Layer-By-Layer Formation Of Three-Dimensional Objects") was filed by Stratasys Powder Production on Dec 18, 2019. The application was issued on Feb 8, 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 |
|---|---|---|
| VOXELJET | Nov 8, 2023 | HOEFER & PARTNER PATENTANWALTE MBB |
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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