Patent No. EP3914754 (titled "Porous Transport Layer Based On Multiple Micro And Nano Sintered Porous Layers") was filed by Paul Scherrer Institut on Jan 14, 2020. The application was issued on Sep 20, 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 |
|---|---|---|
| H TEC SYSTEMS | Jun 19, 2024 | GRTTINGER MHRING VON POSCHINGER |
| QUEST ONE | Jun 19, 2024 | GRATTINGER MOHRING VON POSCHINGER PATENTANWALTE PARTNERSCHAFT 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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