Patent No. EP3156339 (titled "Web Packaging Machine With Variable Depth Forming") was filed by Alkar Rapidpak on Oct 13, 2016. The application was issued on May 29, 2019.

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 |
|---|---|---|
| MULTIVAC SEPP HAGGENMLLER | Feb 13, 2020 | GRNECKER |
| MULTIVAC SEPP HAGGENMULLER | Feb 13, 2020 | GRUNECKER PATENT |
| GEA FOOD SOLUTIONS GERMANY | Feb 10, 2020 | KUTZENBERGER |
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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