The weekly litigation news digest is live. Subscribe now
The patent EP3319948 was granted to Celanese on Jun 30, 2021. The application was filed on Sep 14, 2017 under application number EP17772250A. 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 |
|---|---|---|---|
| AECHTER | Mar 29, 2022 | TER MEER STEINMEISTER & PARTNER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US5744010 |
| DESCRIPTION | US9024016 |
| INTERNATIONAL-SEARCH-REPORT | CN101787001 |
| INTERNATIONAL-SEARCH-REPORT | DE3531357 |
| INTERNATIONAL-SEARCH-REPORT | EP0155634 |
| INTERNATIONAL-SEARCH-REPORT | EP0159516 |
| INTERNATIONAL-SEARCH-REPORT | EP0215347 |
| INTERNATIONAL-SEARCH-REPORT | EP0218076 |
| INTERNATIONAL-SEARCH-REPORT | WO2013182651 |
| INTERNATIONAL-SEARCH-REPORT | WO9319055 |
| OPPOSITION | CN101124981 |
| OPPOSITION | DE3531357 |
| OPPOSITION | RU2035457 |
| OPPOSITION | US4804755 |
| OPPOSITION | US5744010 |
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
Oct 15, 2025
Oct 15, 2025
Oct 15, 2025
Aug 4, 2025
Aug 4, 2025
Aug 4, 2025
Jun 27, 2025
Jun 25, 2025
Jun 24, 2025
(Electronic) Receipt
Appeal
Jun 24, 2025
Jun 24, 2025
Jun 20, 2025
(Electronic) Receipt
Appeal
Jun 20, 2025
Jun 20, 2025
Jun 20, 2025
Jun 16, 2025
(Electronic) Receipt
Appeal
Jun 16, 2025
Jun 16, 2025
May 28, 2025
May 23, 2025
(Electronic) Receipt
Appeal
May 23, 2025
May 23, 2025
May 23, 2025
May 23, 2025
Dec 19, 2024
Dec 19, 2024
Dec 16, 2024
Dec 16, 2024
Oct 1, 2024
Sep 25, 2024
(Electronic) Receipt
Appeal
Sep 25, 2024
Sep 25, 2024
Jul 10, 2024
Jul 5, 2024
(Electronic) Receipt
Appeal
Jul 5, 2024
Jul 5, 2024
Reply to appeal
Appeal
Mar 7, 2024
Mar 5, 2024
Feb 29, 2024
(Electronic) Receipt
Appeal
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Feb 29, 2024
Dec 8, 2023
Dec 8, 2023
Dec 5, 2023
(Electronic) Receipt
Appeal
Dec 5, 2023
Dec 5, 2023
Notice of appeal
Appeal
Nov 6, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Means of redress
OPPO
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Oct 24, 2023
Sep 20, 2023
Jul 28, 2023
Jul 24, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 20, 2023
Jul 19, 2023
Jul 19, 2023
Jul 19, 2023
Jul 18, 2023
Jul 12, 2023
Jul 12, 2023
Jul 12, 2023
Dec 16, 2022
Dec 16, 2022
Nov 28, 2022
Nov 18, 2022
Nov 18, 2022
Nov 18, 2022
Nov 18, 2022
Nov 18, 2022
Nov 18, 2022
Nov 18, 2022
Aug 26, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Aug 22, 2022
Apr 13, 2022
Apr 13, 2022
Apr 5, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Mar 29, 2022
Jul 13, 2021
Jun 4, 2021
Decision to grant a European patent
Search/Exam
May 28, 2021
Change to the inventor details
Search/Exam
May 21, 2021
(Electronic) Receipt
Search/Exam
May 21, 2021
Filing of the translations of the claims
Search/Exam
May 21, 2021
French translation of claims
Search/Exam
May 21, 2021
German translation of the claims
Search/Exam
May 21, 2021
Letter accompanying subsequently filed items
Search/Exam
Apr 8, 2021
Apr 8, 2021
Apr 8, 2021
Apr 8, 2021
Intention to grant (signatures)
Search/Exam
Apr 8, 2021
Text intended for grant (clean copy)
Search/Exam
Apr 8, 2021
Mar 25, 2021
Annex to a communication
Search/Exam
Mar 25, 2021
Annex to a communication
Search/Exam
Mar 25, 2021
Annex to the communication
Search/Exam
Mar 25, 2021
Mar 25, 2021
Mar 25, 2021
Mar 25, 2021
Mar 15, 2021
Amended claims with annotations
Search/Exam
Feb 15, 2021
(Electronic) Receipt
Search/Exam
Feb 15, 2021
Amended claims with annotations
Search/Exam
Feb 15, 2021
Amended claims with annotations
Search/Exam
Feb 15, 2021
Amended claims with annotations
Search/Exam
Feb 15, 2021
Amended claims with annotations
Search/Exam
Feb 15, 2021
Claims
Search/Exam
Feb 15, 2021
Claims
Search/Exam
Feb 15, 2021
Claims
Search/Exam
Feb 15, 2021
Claims
Search/Exam
Feb 15, 2021
Letter accompanying subsequently filed items
Search/Exam
Feb 15, 2021
Nov 2, 2020
Advice of delivery
Search/Exam
Oct 29, 2020
Acknowledgement of a document
Search/Exam
Oct 29, 2020
Annex to the communication
Search/Exam
Oct 29, 2020
Summons to attend oral proceedings
Search/Exam
Jul 28, 2020
(Electronic) Receipt
Search/Exam
Jul 28, 2020
Letter accompanying subsequently filed items
Search/Exam
Jul 28, 2020
Mar 20, 2020
Annex to the communication
Search/Exam
Mar 20, 2020
Communication from the Examining Division
Search/Exam
Jan 27, 2020
(Electronic) Receipt
Search/Exam
Jan 27, 2020
Amended claims with annotations
Search/Exam
Jan 27, 2020
Claims
Search/Exam
Jan 27, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 27, 2020
Sep 17, 2019
Annex to the communication
Search/Exam
Sep 17, 2019
Communication from the Examining Division
Search/Exam
Aug 6, 2019
(Electronic) Receipt
Search/Exam
Aug 6, 2019
Letter accompanying subsequently filed items
Search/Exam
Aug 6, 2019
Apr 11, 2019
Mar 27, 2019
Annex to the communication
Search/Exam
Mar 27, 2019
Communication from the Examining Division
Search/Exam
Feb 13, 2019
(Electronic) Receipt
Search/Exam
Feb 13, 2019
Amended claims with annotations
Search/Exam
Feb 13, 2019
Claims
Search/Exam
Feb 13, 2019
Letter accompanying subsequently filed items
Search/Exam
Feb 13, 2019
Oct 12, 2018
Annex to the communication
Search/Exam
Oct 12, 2018
Communication from the Examining Division
Search/Exam
Oct 5, 2018
Examination started
Search/Exam
Jun 6, 2018
Refund of fees
Search/Exam
May 25, 2018
(Electronic) Receipt
Search/Exam
May 25, 2018
May 25, 2018
Amended claims with annotations
Search/Exam
May 25, 2018
Amendments received before examination
Search/Exam
May 25, 2018
Letter accompanying subsequently filed items
Search/Exam
Apr 18, 2018
Apr 18, 2018
Apr 18, 2018
Mar 29, 2018
Copy of the international search report
Search/Exam
Mar 29, 2018
Published international application - A1
Search/Exam
Jan 31, 2018
(Electronic) Receipt
Search/Exam
Jan 31, 2018
Annex
Search/Exam
Jan 31, 2018
Letter accompanying subsequently filed items
Search/Exam
Jan 31, 2018
Letter concerning the inventor
Search/Exam
Dec 14, 2017
Dec 12, 2017
Nov 30, 2017
Nov 28, 2017
Communication to designated inventor
Search/Exam
Nov 28, 2017
Communication to designated inventor
Search/Exam
Nov 28, 2017
Communication to designated inventor
Search/Exam
Nov 27, 2017
Nov 9, 2017
ISR: cited documents
PCTISA
Nov 8, 2017
Nov 8, 2017
Nov 8, 2017
Oct 25, 2017
(Electronic) Receipt
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Request for entry into the European phase
Search/Exam
Oct 9, 2017
Sep 25, 2017
Abstract
PCTISA
Sep 25, 2017
Annex
PCTISA
Sep 25, 2017
Claims
PCTISA
Sep 25, 2017
Description
PCTISA
Sep 25, 2017
Drawings
PCTISA
Sep 25, 2017
Sep 25, 2017
Sep 25, 2017
Sep 25, 2017