Patent No. EP2128198 (titled "Process For The Preparation Of Polyamides Using Carboxylic Acids And Amides") was filed by Lurgi Zimmer on Feb 23, 2009. The application was issued on Jan 21, 2015.

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 |
|---|---|---|
| UHDE INVENTA-FISCHER GMBH | Oct 21, 2015 | PFENNING, MEINIG & PARTNER MBB, ET AL |
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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