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The patent EP3762537 was granted to Lenzing on Oct 25, 2023. The application was filed on Mar 6, 2019 under application number EP19708327A. 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 |
|---|---|---|---|
| METSA SPRING | Jul 19, 2024 | ESPATENT | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2015184338 |
| DESCRIPTION | US4246221 |
| DESCRIPTION | US6440523 |
| DESCRIPTION | US6444314 |
| DESCRIPTION | WO2010132151 |
| DESCRIPTION | WO2014086883 |
| DESCRIPTION | WO9319230 |
| DESCRIPTION | WO9428214 |
| DESCRIPTION | WO9428217 |
| DESCRIPTION | WO9502082 |
| DESCRIPTION | WO9633221 |
| DESCRIPTION | WO9633934 |
| DESCRIPTION | WO9738153 |
| DESCRIPTION | WO9805702 |
| DESCRIPTION | WO9816682 |
| DESCRIPTION | WO9947733 |
| INTERNATIONAL-SEARCH-REPORT | US2015184338 |
| INTERNATIONAL-SEARCH-REPORT | WO2010132151 |
| INTERNATIONAL-SEARCH-REPORT | WO9816682 |
| INTERNATIONAL-SEARCH-REPORT | WO9947733 |
| OPPOSITION | EP1441050 |
| OPPOSITION | US2002036070 |
| OPPOSITION | US2015376835 |
| OPPOSITION | US8802229 |
| OPPOSITION | WO9816682 |
| OTHER | US2002036070 |
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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Dec 10, 2025
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Means of redress
OPPO
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Nov 8, 2023
Sep 28, 2023
Decision to grant a European patent
Search/Exam
Sep 13, 2023
(Electronic) Receipt
Search/Exam
Sep 13, 2023
English translation of the claims
Search/Exam
Sep 13, 2023
Filing of the translations of the claims
Search/Exam
Sep 13, 2023
French translation of claims
Search/Exam
May 17, 2023
May 17, 2023
May 17, 2023
May 17, 2023
Intention to grant (signatures)
Search/Exam
May 17, 2023
Text intended for grant (clean copy)
Search/Exam
May 17, 2023
Jan 4, 2023
(Electronic) Receipt
Search/Exam
Jan 4, 2023
Letter accompanying subsequently filed items
Search/Exam
Jan 4, 2023
Nov 17, 2022
Nov 14, 2022
(Electronic) Receipt
Search/Exam
Nov 14, 2022
Letter accompanying subsequently filed items
Search/Exam
Nov 14, 2022
Sep 30, 2022
Sep 26, 2022
(Electronic) Receipt
Search/Exam
Sep 26, 2022
Letter accompanying subsequently filed items
Search/Exam
Sep 26, 2022
Matter concerning the application
Search/Exam
Aug 2, 2022
Jul 5, 2022
Annex to the communication
Search/Exam
Jul 5, 2022
Communication from the Examining Division
Search/Exam
Jul 1, 2022
Jun 27, 2022
(Electronic) Receipt
Search/Exam
Jun 27, 2022
Citation filed by a third party
Search/Exam
Jun 27, 2022
Letter accompanying subsequently filed items
Search/Exam
Jun 27, 2022
Matter concerning the application
Search/Exam
Jun 14, 2022
Jun 14, 2022
Jun 3, 2022
Non-patent literature filed by a third party
Search/Exam
Jun 3, 2022
Non-patent literature filed by a third party
Search/Exam
Jun 3, 2022
Non-patent literature filed by a third party
Search/Exam
Jun 3, 2022
Observations by third parties
Search/Exam
Jun 3, 2022
Patent document filed by a Third party
Search/Exam
Mar 1, 2022
Mar 1, 2022
Mar 1, 2022
Intention to grant (signatures)
Search/Exam
Mar 1, 2022
Text intended for grant (clean copy)
Search/Exam
Mar 1, 2022
Oct 6, 2021
(Electronic) Receipt
Search/Exam
Oct 6, 2021
Amended description with annotations
Search/Exam
Oct 6, 2021
Description
Search/Exam
Oct 6, 2021
Letter accompanying subsequently filed items
Search/Exam
Oct 6, 2021
Aug 10, 2021
Annex to the communication
Search/Exam
Aug 10, 2021
Communication from the Examining Division
Search/Exam
Jul 23, 2021
Examination started
Search/Exam
Apr 23, 2021
(Electronic) Receipt
Search/Exam
Apr 23, 2021
Apr 23, 2021
Amendments received before examination
Search/Exam
Apr 23, 2021
Letter accompanying subsequently filed items
Search/Exam
Dec 16, 2020
Oct 13, 2020
Oct 9, 2020
Communication to designated inventor
Search/Exam
Oct 9, 2020
Communication to designated inventor
Search/Exam
Oct 9, 2020
Communication to designated inventor
Search/Exam
Oct 9, 2020
Communication to designated inventor
Search/Exam
Oct 9, 2020
Communication to designated inventor
Search/Exam
Oct 6, 2020
Priority search results copy provided by EPO
Search/Exam
Sep 21, 2020
Aug 25, 2020
(Electronic) Receipt
Search/Exam
Aug 25, 2020
Request for entry into the European phase
Search/Exam
Jul 17, 2020
Information on entry into European phase
Search/Exam
Oct 2, 2019
Oct 2, 2019
Sep 12, 2019
Copy of the international search report
Search/Exam
Sep 12, 2019
Copy of the international search report
Search/Exam
Sep 12, 2019
Published international application - A1
Search/Exam
Aug 28, 2019
(Electronic) Receipt
PCTRO
Aug 28, 2019
Aug 28, 2019
Aug 28, 2019
RO101 Declaration
PCTRO
Aug 20, 2019
(Electronic) Receipt
PCTRO
Aug 20, 2019
Aug 20, 2019
Aug 20, 2019
RO101 Declaration
PCTRO
Jun 19, 2019
(Electronic) Receipt
PCTRO
Jun 19, 2019
Jun 19, 2019
RO101 Declaration
PCTRO
May 16, 2019
Apr 30, 2019
Mar 15, 2019
Mar 6, 2019
(Electronic) Receipt
PCTRO
Mar 6, 2019
Abstract
PCTRO
Mar 6, 2019
Claims
PCTRO
Mar 6, 2019
Description
PCTRO
Mar 6, 2019
Mar 6, 2019
Drawings
PCTRO
Mar 6, 2019
Mar 6, 2019