The weekly litigation news digest is live. Subscribe now
The patent EP3606991 was granted to Eastman Chemical on Feb 19, 2025. The application was filed on Apr 2, 2018 under application number EP18722776A. 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 |
|---|---|---|---|
| RAIN CARBON GERMANY | Nov 19, 2025 | COHAUSZ & FLORACK | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | WO2004EP52743 |
| DESCRIPTION | EP2288653 |
| DESCRIPTION | US2008161452 |
| DESCRIPTION | US2008161462 |
| DESCRIPTION | US2008161486 |
| DESCRIPTION | US2011252671 |
| DESCRIPTION | US2013291409 |
| DESCRIPTION | US2016222197 |
| DESCRIPTION | US4160692 |
| DESCRIPTION | US6214935 |
| DESCRIPTION | US7968633 |
| DESCRIPTION | US7968634 |
| DESCRIPTION | US7968635 |
| DESCRIPTION | US7968636 |
| DESCRIPTION | US8252863 |
| DESCRIPTION | US8689381 |
| DESCRIPTION | WO2007033720 |
| DESCRIPTION | WO2008083242 |
| DESCRIPTION | WO2010059402 |
| DESCRIPTION | WO9909036 |
| INTERNATIONAL-SEARCH-REPORT | KR20160074729 |
| INTERNATIONAL-SEARCH-REPORT | US2012276353 |
| INTERNATIONAL-SEARCH-REPORT | WO2016135242 |
| OPPOSITION | US5502140 |
| OPPOSITION | WO2016102344 |
| OPPOSITION | WO2017014839 |
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
Get instant alerts for new documents
Dec 1, 2025
Dec 1, 2025
Nov 24, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Nov 19, 2025
Mar 4, 2025
Jan 23, 2025
Decision to grant a European patent
Search/Exam
Jan 10, 2025
(Electronic) Receipt
Search/Exam
Jan 10, 2025
French translation of claims
Search/Exam
Jan 10, 2025
German translation of the claims
Search/Exam
Jan 10, 2025
Letter accompanying subsequently filed items
Search/Exam
Sep 27, 2024
Sep 27, 2024
Sep 27, 2024
Sep 27, 2024
Intention to grant (signatures)
Search/Exam
Sep 27, 2024
Text intended for grant (clean copy)
Search/Exam
Sep 27, 2024
Apr 24, 2024
(Electronic) Receipt
Search/Exam
Apr 24, 2024
Amended claims with annotations
Search/Exam
Apr 24, 2024
Claims
Search/Exam
Apr 24, 2024
Letter accompanying subsequently filed items
Search/Exam
Apr 24, 2024
Feb 21, 2024
Annex to the communication
Search/Exam
Feb 21, 2024
Communication from the Examining Division
Search/Exam
Oct 27, 2023
(Electronic) Receipt
Search/Exam
Oct 27, 2023
Amended claims with annotations
Search/Exam
Oct 27, 2023
Amended description with annotations
Search/Exam
Oct 27, 2023
Claims
Search/Exam
Oct 27, 2023
Description
Search/Exam
Oct 27, 2023
Letter accompanying subsequently filed items
Search/Exam
Oct 27, 2023
Aug 1, 2023
Annex to the communication
Search/Exam
Aug 1, 2023
Communication from the Examining Division
Search/Exam
Feb 14, 2023
(Electronic) Receipt
Search/Exam
Feb 14, 2023
Amended description with annotations
Search/Exam
Feb 14, 2023
Description
Search/Exam
Feb 14, 2023
Letter accompanying subsequently filed items
Search/Exam
Feb 14, 2023
Dec 5, 2022
Annex to the communication
Search/Exam
Dec 5, 2022
Communication from the Examining Division
Search/Exam
Sep 28, 2022
Jul 18, 2022
Jul 8, 2022
(Electronic) Receipt
Search/Exam
Jul 8, 2022
Amended claims with annotations
Search/Exam
Jul 8, 2022
Claims
Search/Exam
Jul 8, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 8, 2022
Jul 5, 2022
Annexes in respect of a client data request
Search/Exam
Jul 5, 2022
Annexes in respect of a client data request
Search/Exam
Jul 5, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 5, 2022
May 24, 2022
Refund of fees
Search/Exam
Mar 1, 2022
Annex to the communication
Search/Exam
Mar 1, 2022
Communication from the Examining Division
Search/Exam
Jan 26, 2022
(Electronic) Receipt
Search/Exam
Jan 26, 2022
Amended claims with annotations
Search/Exam
Jan 26, 2022
Claims
Search/Exam
Jan 26, 2022
Letter accompanying subsequently filed items
Search/Exam
Jan 26, 2022
Oct 1, 2021
Oct 1, 2021
Oct 1, 2021
Intention to grant (signatures)
Search/Exam
Oct 1, 2021
Text intended for grant (clean copy)
Search/Exam
Oct 1, 2021
Aug 6, 2021
(Electronic) Receipt
Search/Exam
Aug 6, 2021
Amended claims with annotations
Search/Exam
Aug 6, 2021
Claims
Search/Exam
Aug 6, 2021
Letter accompanying subsequently filed items
Search/Exam
Aug 6, 2021
Jun 21, 2021
Jun 21, 2021
Jun 21, 2021
Intention to grant (signatures)
Search/Exam
Jun 21, 2021
Text intended for grant (clean copy)
Search/Exam
Jun 21, 2021
Apr 27, 2021
(Electronic) Receipt
Search/Exam
Apr 27, 2021
Amended claims with annotations
Search/Exam
Apr 27, 2021
Claims
Search/Exam
Apr 27, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 27, 2021
Jan 20, 2021
Jan 20, 2021
Jan 20, 2021
Intention to grant (signatures)
Search/Exam
Jan 20, 2021
Text intended for grant (clean copy)
Search/Exam
Jan 20, 2021
Nov 25, 2020
Examination started
Search/Exam
Apr 15, 2020
(Electronic) Receipt
Search/Exam
Apr 15, 2020
Apr 15, 2020
Amended claims with annotations
Search/Exam
Apr 15, 2020
Amendments received before examination
Search/Exam
Apr 15, 2020
Letter accompanying subsequently filed items
Search/Exam
Feb 18, 2020
Feb 10, 2020
Letter which had not been notified
Search/Exam
Jan 22, 2020
Communication to designated inventor
Search/Exam
Jan 15, 2020
Jan 14, 2020
Letter concerning the inventor
Search/Exam
Dec 13, 2019
Dec 10, 2019
Letter which had not been notified
Search/Exam
Nov 12, 2019
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Nov 8, 2019
Communication to designated inventor
Search/Exam
Oct 22, 2019
Oct 3, 2019
Citation filed by a third party
Search/Exam
Oct 3, 2019
Citation filed by a third party
Search/Exam
Oct 3, 2019
Citation filed by a third party
Search/Exam
Oct 3, 2019
Citation filed by a third party
Search/Exam
Oct 3, 2019
Observations by third parties
Search/Exam
Oct 3, 2019
Observations by third parties
Search/Exam
Oct 2, 2019
(Electronic) Receipt
Search/Exam
Oct 2, 2019
Request for entry into the European phase
Search/Exam
Aug 19, 2019
Information on entry into European phase
Search/Exam
Jan 14, 2019
Annex
PCTISA
Jan 14, 2019
Jan 14, 2019
Oct 30, 2018
Oct 11, 2018
Copy of the international search report
Search/Exam
Oct 11, 2018
Published international application - A1
Search/Exam
Jul 30, 2018
ISR: cited documents
PCTISA
Jul 27, 2018
Jul 27, 2018
Jul 27, 2018
May 23, 2018
Apr 20, 2018
Abstract
PCTISA
Apr 20, 2018
Annex
PCTISA
Apr 20, 2018
Claims
PCTISA
Apr 20, 2018
Description
PCTISA
Apr 20, 2018
Drawings
PCTISA
Apr 20, 2018
Apr 20, 2018
Apr 20, 2018
Apr 20, 2018
Apr 20, 2018