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The patent EP3322695 was granted to Celanese on Jan 1, 2025. The application was filed on Sep 14, 2017 under application number EP17772569A. The patent is currently recorded with a legal status of "Patent Maintained As Amended".

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 |
|---|---|---|---|
| ANHUI JINHE INDUSTRIAL | Apr 22, 2021 | COHAUSZ & FLORACK | ADMISSIBLE |
| HAMMER | Apr 21, 2021 | GRUNECKER PATENT | 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 | DE3531357 |
| INTERNATIONAL-SEARCH-REPORT | EP0155634 |
| INTERNATIONAL-SEARCH-REPORT | EP0159516 |
| INTERNATIONAL-SEARCH-REPORT | EP0215347 |
| INTERNATIONAL-SEARCH-REPORT | EP0218076 |
| INTERNATIONAL-SEARCH-REPORT | WO2013182651 |
| OPPOSITION | CN101124981 |
| OPPOSITION | CN103130743 |
| OPPOSITION | CN1323792 |
| OPPOSITION | DE3527070 |
| OPPOSITION | EP0215347 |
| OPPOSITION | EP0218076 |
| OPPOSITION | RU2035457 |
| OPPOSITION | US2005182255 |
| OPPOSITION | US2009318685 |
| OPPOSITION | US4607100 |
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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(Electronic) Receipt
Appeal
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Appeal
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(Electronic) Receipt
Appeal
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Reply to appeal
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(Electronic) Receipt
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(Electronic) Receipt
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Reply to appeal
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Notice of appeal
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Appeal
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Decision to grant a European patent
Search/Exam
Jun 16, 2020
(Electronic) Receipt
Search/Exam
Jun 16, 2020
Filing of the translations of the claims
Search/Exam
Jun 16, 2020
French translation of claims
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Jun 16, 2020
German translation of the claims
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Jun 16, 2020
Letter accompanying subsequently filed items
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Feb 11, 2020
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Intention to grant (signatures)
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Feb 11, 2020
Text intended for grant (clean copy)
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Feb 11, 2020
Dec 9, 2019
(Electronic) Receipt
Search/Exam
Dec 9, 2019
Amended description with annotations
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Dec 9, 2019
Description
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Dec 9, 2019
Letter accompanying subsequently filed items
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Sep 23, 2019
Annex to the communication
Search/Exam
Sep 23, 2019
Communication from the Examining Division
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Aug 8, 2019
(Electronic) Receipt
Search/Exam
Aug 8, 2019
Letter accompanying subsequently filed items
Search/Exam
Aug 8, 2019
Apr 11, 2019
Mar 29, 2019
Annex to the communication
Search/Exam
Mar 29, 2019
Communication from the Examining Division
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Feb 13, 2019
(Electronic) Receipt
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Feb 13, 2019
Amended claims with annotations
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Feb 13, 2019
Claims
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Feb 13, 2019
Letter accompanying subsequently filed items
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Feb 13, 2019
Oct 12, 2018
Annex to the communication
Search/Exam
Oct 12, 2018
Communication from the Examining Division
Search/Exam
Oct 8, 2018
Examination started
Search/Exam
Jun 6, 2018
Refund of fees
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May 25, 2018
(Electronic) Receipt
Search/Exam
May 25, 2018
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Amended claims with annotations
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May 25, 2018
Amendments received before examination
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May 25, 2018
Letter accompanying subsequently filed items
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Apr 25, 2018
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Mar 29, 2018
Copy of the international search report
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Mar 29, 2018
Published international application - A1
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Jan 31, 2018
(Electronic) Receipt
Search/Exam
Jan 31, 2018
Letter accompanying subsequently filed items
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Jan 31, 2018
Letter concerning the inventor
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Jan 31, 2018
Notification of the recording of a change
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Dec 15, 2017
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Communication to designated inventor
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Nov 28, 2017
Communication to designated inventor
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Nov 28, 2017
Communication to designated inventor
Search/Exam
Nov 27, 2017
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ISR: cited documents
PCTISA
Nov 8, 2017
Nov 8, 2017
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Oct 25, 2017
(Electronic) Receipt
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
Search/Exam
Oct 25, 2017
Annex
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Oct 25, 2017
Annex
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Oct 25, 2017
Annex
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Oct 25, 2017
Annex
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Oct 25, 2017
Annex
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Oct 25, 2017
Annex
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Oct 25, 2017
Request for entry into the European phase
Search/Exam
Oct 10, 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
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