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The patent EP2836581 was granted to CP Kelco on Apr 7, 2021. The application was filed on Feb 15, 2013 under application number EP13706882A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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 |
|---|---|---|---|
| RHODIA OPERATIONS | Jan 7, 2022 | KRAUS & LEDERER PARTGMBB | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2007027108 |
| DESCRIPTION | US2008108541 |
| DESCRIPTION | US2008108714 |
| DESCRIPTION | US5951910 |
| DESCRIPTION | US6241812 |
| DESCRIPTION | US7888308 |
| DESCRIPTION | US8053216 |
| INTERNATIONAL-SEARCH-REPORT | US2008108714 |
| INTERNATIONAL-SEARCH-REPORT | US2010016575 |
| OPPOSITION | CN102206689 |
| OPPOSITION | JP2009296979 |
| OPPOSITION | JPH05292984 |
| OPPOSITION | US2007197779 |
| OPPOSITION | US2010210501 |
| OPPOSITION | US5009797 |
| OPPOSITION | US5951910 |
| OPPOSITION | WO2011019876 |
| OPPOSITION | WO9806792 |
| OPPOSITION | WO9841592 |
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.
Date
Description
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Nov 18, 2025
Nov 18, 2025
Apr 8, 2025
(Electronic) Receipt
Appeal
Apr 8, 2025
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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Reply to appeal
Appeal
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(Electronic) Receipt
Appeal
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Appeal
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Mar 29, 2024
(Electronic) Receipt
Appeal
Mar 29, 2024
Notice of appeal
Appeal
Mar 29, 2024
Notice of appeal
Appeal
Feb 12, 2024
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Means of redress
Search/Exam
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Apr 20, 2021
Mar 12, 2021
Decision to grant a European patent
Search/Exam
Feb 11, 2021
(Electronic) Receipt
Search/Exam
Feb 11, 2021
Filing of the translations of the claims
Search/Exam
Feb 11, 2021
French translation of claims
Search/Exam
Feb 11, 2021
German translation of the claims
Search/Exam
Feb 11, 2021
Letter accompanying subsequently filed items
Search/Exam
Oct 14, 2020
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Intention to grant (signatures)
Search/Exam
Oct 14, 2020
Text intended for grant (clean copy)
Search/Exam
Oct 14, 2020
Aug 24, 2020
(Electronic) Receipt
Search/Exam
Aug 24, 2020
Amended claims with annotations
Search/Exam
Aug 24, 2020
Claims
Search/Exam
Aug 24, 2020
Letter accompanying subsequently filed items
Search/Exam
Aug 24, 2020
Apr 24, 2020
Annex to the communication
Search/Exam
Apr 24, 2020
Communication from the Examining Division
Search/Exam
Jan 20, 2020
Document concerning representation
Search/Exam
Nov 22, 2019
Submission concerning representation
Search/Exam
Aug 1, 2018
(Electronic) Receipt
Search/Exam
Aug 1, 2018
Amended claims with annotations
Search/Exam
Aug 1, 2018
Amended claims with annotations
Search/Exam
Aug 1, 2018
Amended description with annotations
Search/Exam
Aug 1, 2018
Claims
Search/Exam
Aug 1, 2018
Claims
Search/Exam
Aug 1, 2018
Description
Search/Exam
Aug 1, 2018
Letter accompanying subsequently filed items
Search/Exam
Aug 1, 2018
Apr 26, 2018
Annex to the communication
Search/Exam
Apr 26, 2018
Communication from the Examining Division
Search/Exam
Apr 19, 2018
Examination started
Search/Exam
Jan 25, 2018
Oct 24, 2017
Submission concerning representation
Search/Exam
Sep 19, 2017
Sep 7, 2017
May 19, 2015
(Electronic) Receipt
Search/Exam
May 19, 2015
May 19, 2015
Amended claims with annotations
Search/Exam
May 19, 2015
May 19, 2015
Amended description with annotations
Search/Exam
May 19, 2015
Amendments received before examination
Search/Exam
May 19, 2015
Letter accompanying subsequently filed items
Search/Exam
Feb 3, 2015
Jan 27, 2015
Letter which had not been notified
Search/Exam
Jan 21, 2015
Dec 5, 2014
Nov 18, 2014
Communication to designated inventor
Search/Exam
Nov 18, 2014
Communication to designated inventor
Search/Exam
Nov 18, 2014
Communication to designated inventor
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Nov 18, 2014
Communication to designated inventor
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Nov 18, 2014
Communication to designated inventor
Search/Exam
Oct 29, 2014
Sep 23, 2014
(Electronic) Receipt
Search/Exam
Sep 23, 2014
Request for entry into the European phase
Search/Exam
Sep 10, 2014
Submission concerning representation
Search/Exam
Aug 22, 2014
Information on entry into European phase
Search/Exam
Nov 8, 2013
Oct 17, 2013
Copy of the international search report
Search/Exam
Oct 17, 2013
Published international application - A1
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May 16, 2013
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Feb 28, 2013
Abstract
PCTISA
Feb 28, 2013
Claims
PCTISA
Feb 28, 2013
Description
PCTISA