Patent No. EP2641481 (titled "Filter Rod Production Machine And Method For Operating A Filter Rod Production Machine In The Tobacco Processing Industry") was filed by Hauni Maschinenbau on Mar 13, 2013. The application was issued on May 11, 2016.

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.
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