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The patent EP3545022 was granted to Omya on Aug 24, 2022. The application was filed on Nov 21, 2017 under application number EP17808831A. 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 |
|---|---|---|---|
| SCHAEFER KALK | May 16, 2023 | MAI BESIER | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE4313510 |
| DESCRIPTION | EP0554654 |
| DESCRIPTION | EP0785858 |
| DESCRIPTION | EP1052269 |
| DESCRIPTION | EP1068949 |
| DESCRIPTION | EP1092000 |
| DESCRIPTION | EP1112167 |
| DESCRIPTION | EP1612237 |
| DESCRIPTION | EP2070991 |
| DESCRIPTION | EP2264108 |
| DESCRIPTION | EP2264109 |
| DESCRIPTION | EP2390285 |
| DESCRIPTION | EP2722368 |
| DESCRIPTION | EP2770017 |
| DESCRIPTION | US2004097616 |
| DESCRIPTION | US2006115548 |
| DESCRIPTION | US2012031576 |
| DESCRIPTION | US3897519 |
| DESCRIPTION | US4126650 |
| DESCRIPTION | US4350645 |
| DESCRIPTION | US4921990 |
| DESCRIPTION | US5554781 |
| DESCRIPTION | US6710199 |
| DESCRIPTION | US7297755 |
| DESCRIPTION | WO03033574 |
| DESCRIPTION | WO2008023076 |
| DESCRIPTION | WO2009074492 |
| DESCRIPTION | WO2014100265 |
| DESCRIPTION | WO2016023937 |
| INTERNATIONAL-SEARCH-REPORT | JP2011190387 |
| INTERNATIONAL-SEARCH-REPORT | JP2015086241 |
| INTERNATIONAL-SEARCH-REPORT | JPH07331038 |
| INTERNATIONAL-SEARCH-REPORT | US2013331493 |
| OPPOSITION | EP2679633 |
| OPPOSITION | EP2722368 |
| OPPOSITION | EP2736973 |
| OPPOSITION | JP5969239B |
| OPPOSITION | US2015240040 |
| OPPOSITION | US2015322604 |
| OPPOSITION | US4595715 |
| OPPOSITION | US5866246 |
| OPPOSITION | US8604123 |
| OPPOSITION | WO2010059343 |
| OPPOSITION | WO2012052778 |
| OPPOSITION | WO2015158758 |
| OPPOSITION | WO2015181037 |
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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Sep 26, 2025
Sep 26, 2025
Sep 19, 2025
Sep 18, 2025
Sep 16, 2025
(Electronic) Receipt
Appeal
Sep 16, 2025
Sep 16, 2025
Sep 15, 2025
(Electronic) Receipt
Appeal
Sep 15, 2025
Jul 16, 2025
Jul 16, 2025
Jul 16, 2025
Jul 16, 2025
Jul 11, 2025
Jul 9, 2025
May 30, 2025
May 28, 2025
(Electronic) Receipt
Appeal
May 28, 2025
May 28, 2025
Reply to appeal
Appeal
Feb 21, 2025
Feb 21, 2025
Feb 18, 2025
Jan 31, 2025
Jan 28, 2025
(Electronic) Receipt
Appeal
Jan 28, 2025
Jan 28, 2025
Jan 2, 2025
Jan 2, 2025
Dec 18, 2024
(Electronic) Receipt
Appeal
Dec 18, 2024
Dec 18, 2024
Notice of appeal
Appeal
Nov 25, 2024
Nov 25, 2024
Nov 25, 2024
Nov 25, 2024
Nov 25, 2024
Nov 25, 2024
Nov 25, 2024
Means of redress
OPPO
Nov 25, 2024
Nov 25, 2024
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Nov 21, 2024
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May 16, 2023
Dec 23, 2022
Dec 19, 2022
Letter accompanying subsequently filed items
Search/Exam
Dec 19, 2022
Oct 13, 2022
Document concerning representation
Search/Exam
Sep 6, 2022
Jul 28, 2022
Decision to grant a European patent
Search/Exam
Jul 13, 2022
(Electronic) Receipt
Search/Exam
Jul 13, 2022
French translation of claims
Search/Exam
Jul 13, 2022
German translation of the claims
Search/Exam
Jul 13, 2022
Letter accompanying subsequently filed items
Search/Exam
Mar 31, 2022
Mar 31, 2022
Mar 31, 2022
Intention to grant (signatures)
Search/Exam
Mar 31, 2022
Text intended for grant (clean copy)
Search/Exam
Mar 31, 2022
Feb 14, 2022
(Electronic) Receipt
Search/Exam
Feb 14, 2022
Amended description with annotations
Search/Exam
Feb 14, 2022
Description
Search/Exam
Feb 14, 2022
Letter accompanying subsequently filed items
Search/Exam
Feb 14, 2022
Jan 28, 2022
Jan 28, 2022
Jan 28, 2022
Intention to grant (signatures)
Search/Exam
Jan 28, 2022
Text intended for grant (clean copy)
Search/Exam
Jan 28, 2022
Jan 25, 2022
Jan 19, 2022
(Electronic) Receipt
Search/Exam
Jan 19, 2022
Enquiry as to the processing of the file
Search/Exam
Jan 19, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 9, 2021
(Electronic) Receipt
Search/Exam
Jul 9, 2021
Amended claims with annotations
Search/Exam
Jul 9, 2021
Claims
Search/Exam
Jul 9, 2021
Letter accompanying subsequently filed items
Search/Exam
Jul 9, 2021
Mar 11, 2021
Annex to the communication
Search/Exam
Mar 11, 2021
Communication from the Examining Division
Search/Exam
Mar 3, 2021
Examination started
Search/Exam
Sep 18, 2020
Sep 7, 2020
(Electronic) Receipt
Search/Exam
Sep 7, 2020
Enquiry as to the processing of the file
Search/Exam
Sep 7, 2020
Letter accompanying subsequently filed items
Search/Exam
Sep 4, 2019
Jul 5, 2019
Jul 3, 2019
Communication to designated inventor
Search/Exam
Jul 3, 2019
Communication to designated inventor
Search/Exam
Jul 3, 2019
Communication to designated inventor
Search/Exam
Jul 3, 2019
Communication to designated inventor
Search/Exam
Jun 28, 2019
Priority search results copy provided by EPO
Search/Exam
Jun 19, 2019
(Electronic) Receipt
Search/Exam
Jun 19, 2019
Letter concerning fees and payments
Search/Exam
Jun 18, 2019
(Electronic) Receipt
Search/Exam
Jun 18, 2019
Jun 18, 2019
Amended claims with annotations
Search/Exam
Jun 18, 2019
Amendments received before examination
Search/Exam
Jun 18, 2019
Request for entry into the European phase
Search/Exam
Jun 11, 2019
Apr 5, 2019
Information on entry into European phase
Search/Exam
Jun 20, 2018
May 31, 2018
Copy of the international search report
Search/Exam
May 31, 2018
Published international application - A1
Search/Exam
May 22, 2018
Jan 31, 2018
Jan 31, 2018
Jan 31, 2018
Jan 16, 2018
Dec 1, 2017
Nov 21, 2017
(Electronic) Receipt
PCTRO
Nov 21, 2017
Abstract
PCTRO
Nov 21, 2017
Claims
PCTRO
Nov 21, 2017
Description
PCTRO
Nov 21, 2017
Nov 21, 2017
Nov 21, 2017