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The patent EP3546550 was granted to Afton Chemical on May 5, 2021. The application was filed on Mar 13, 2019 under application number EP19162686A. The patent is currently recorded with a legal status of "Opposition Rejected".

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 | Opposition Status |
|---|---|---|---|
| THE LUBRIZOL | Feb 3, 2022 | D YOUNG | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2006252656 |
| DESCRIPTION | US2006252657 |
| DESCRIPTION | US2012101017 |
| DESCRIPTION | US2063629 |
| DESCRIPTION | US2224695 |
| DESCRIPTION | US2447288 |
| DESCRIPTION | US2616905 |
| DESCRIPTION | US3984448 |
| DESCRIPTION | US4029588 |
| DESCRIPTION | US4431552 |
| DESCRIPTION | US4943672 |
| DESCRIPTION | US5344579 |
| DESCRIPTION | US5354484 |
| DESCRIPTION | US5763372 |
| DESCRIPTION | US5882505 |
| DESCRIPTION | US6013171 |
| DESCRIPTION | US6080301 |
| DESCRIPTION | US6096940 |
| DESCRIPTION | US6103099 |
| DESCRIPTION | US6165949 |
| DESCRIPTION | US6180575 |
| DESCRIPTION | US6548458 |
| DESCRIPTION | US7732390 |
| DESCRIPTION | WO8707638 |
| OPPOSITION | CN1209449C |
| OPPOSITION | EP0761805 |
| OPPOSITION | GB1266214 |
| OPPOSITION | US2003119682 |
| OPPOSITION | US2004138073 |
| OPPOSITION | US2008200357 |
| OPPOSITION | US2017335224 |
| OPPOSITION | US3125528 |
| OPPOSITION | US5354484 |
| OPPOSITION | US5552068 |
| OPPOSITION | WO2009042586 |
| OPPOSITION | WO2016089565 |
| OPPOSITION | WO2016099490 |
| OPPOSITION | WO2018112135 |
| SEARCH | US2005014656 |
| SEARCH | US5354484 |
| SEARCH | WO2004007652 |
| SEARCH | WO2008095805 |
| SEARCH | WO2016089565 |
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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Description
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(Electronic) Receipt
Search/Exam
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Decision to grant a European patent
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(Electronic) Receipt
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French translation of claims
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German translation of the claims
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Letter accompanying subsequently filed items
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Intention to grant (signatures)
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(Electronic) Receipt
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Description
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Letter accompanying subsequently filed items
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Intention to grant (signatures)
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Text intended for grant (clean copy)
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Examination started
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(Electronic) Receipt
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Amended claims with annotations
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Mar 27, 2020
Amendments received before examination
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Letter accompanying subsequently filed items
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Notification of forthcoming publication
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European search opinion
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European search report
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Information on Search Strategy
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Search started
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Communication to designated inventor
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Abstract
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Claims
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Description
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Designation of inventor
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Mar 13, 2019
Request for grant of a European patent
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