Patent No. EP1835861 (titled "Method And Apparatus For Patterned Plasma-Mediated Laser Trephination Of The Lens Capsule And Three Dimensional Phaco-Segmentation") was filed by AMO on Jan 10, 2006. The application was issued on Sep 22, 2021.

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.
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.