Patent No. EP3690829 (titled "A Security Sheet Or Document Having One Or More Enhanced Watermarks") was filed by Crane on Dec 2, 2014. The application was issued on Nov 30, 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 |
|---|---|---|
| LEONHARD KURZ STIFTUNG | Aug 30, 2023 | ZINSINGER |
| OBERTHUR FIDUCIAIRE VHP SECURITY PAPER | Aug 30, 2023 | CABINET NONY |
| OBERTHUR FIDUCIAIRE VHP SECURITY PAPER | Aug 30, 2023 | IPSILON |
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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