Patent No. EP1878177 (titled "Fixed Hs-Dsch Or E-Dch Allocation For Voip (Or Hs-Dsch Without Hs-Scch/E-Dch Without E-Dpcch)") was filed by Asset Trust on Apr 25, 2006. The application was issued on Jan 26, 2022.

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 |
|---|---|---|
| LG ELECTRONICS | Nov 30, 2018 | KATERLE |
| ZTE DEUTSCHLAND | Aug 22, 2018 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB |
| HUAWEI DEUTSCHLAND | Jul 23, 2018 | EMMERLING |
| LG ELECTRONICS DEUTSCHLAND | Jul 6, 2018 | KATERLE |
| HUAWEI | Mar 21, 2018 | EMMERLING |
| ZTE | Mar 20, 2018 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE 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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