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The patent EP3781540 was granted to Maxamcorp on Jun 15, 2022. The application was filed on Apr 15, 2019 under application number EP19716446A. 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 |
|---|---|---|---|
| DYNO NOBEL | Mar 14, 2023 | CLEVELAND SCOTT YORK | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | EP0203230 |
| DESCRIPTION | EP1002777 |
| DESCRIPTION | EP1207145 |
| DESCRIPTION | US3303738 |
| DESCRIPTION | US3380033 |
| DESCRIPTION | US3400026 |
| DESCRIPTION | US3582411 |
| DESCRIPTION | US3610088 |
| DESCRIPTION | US3678140 |
| DESCRIPTION | US3706607 |
| DESCRIPTION | US3711345 |
| DESCRIPTION | US3713919 |
| DESCRIPTION | US3770522 |
| DESCRIPTION | US3790415 |
| DESCRIPTION | US3886010 |
| DESCRIPTION | US6949153 |
| DESCRIPTION | WO2014154824 |
| INTERNATIONAL-SEARCH-REPORT | EP1002777 |
| INTERNATIONAL-SEARCH-REPORT | EP3231786 |
| INTERNATIONAL-SEARCH-REPORT | US2018029950 |
| INTERNATIONAL-SEARCH-REPORT | US3610088 |
| INTERNATIONAL-SEARCH-REPORT | US6070511 |
| INTERNATIONAL-SEARCH-REPORT | US9327257 |
| INTERNATIONAL-SEARCH-REPORT | WO9914554 |
| OPPOSITION | CA2294893 |
| OPPOSITION | EP1002777 |
| OPPOSITION | EP1207145 |
| OPPOSITION | GB1362352 |
| OPPOSITION | US6949153 |
| OPPOSITION | WO2014123562 |
| OPPOSITION | WO2015140462 |
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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Aug 22, 2025
Aug 18, 2025
(Electronic) Receipt
Appeal
Aug 18, 2025
Aug 18, 2025
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Apr 15, 2025
(Electronic) Receipt
Appeal
Apr 15, 2025
Apr 15, 2025
Apr 14, 2025
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Feb 14, 2025
(Electronic) Receipt
Appeal
Feb 14, 2025
Feb 14, 2025
Notice of appeal
Appeal
Feb 11, 2025
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Means of redress
OPPO
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Aug 30, 2022
Aug 25, 2022
(Electronic) Receipt
Search/Exam
Aug 25, 2022
Annexes in respect of a client data request
Search/Exam
Aug 25, 2022
Annexes in respect of a client data request
Search/Exam
Aug 25, 2022
Annexes in respect of a client data request
Search/Exam
Aug 25, 2022
Letter accompanying subsequently filed items
Search/Exam
Aug 25, 2022
Jul 22, 2022
Jul 14, 2022
(Electronic) Receipt
Search/Exam
Jul 14, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 14, 2022
Jun 28, 2022
May 19, 2022
Decision to grant a European patent
Search/Exam
May 6, 2022
(Electronic) Receipt
Search/Exam
May 6, 2022
Filing of the translations of the claims
Search/Exam
May 6, 2022
French translation of claims
Search/Exam
May 6, 2022
German translation of the claims
Search/Exam
May 6, 2022
Letter accompanying subsequently filed items
Search/Exam
Jan 20, 2022
Jan 20, 2022
Jan 20, 2022
Intention to grant (signatures)
Search/Exam
Jan 20, 2022
Text intended for grant (clean copy)
Search/Exam
Jan 20, 2022
Jan 4, 2022
Examination started
Search/Exam
Jan 27, 2021
Dec 23, 2020
Dec 15, 2020
Letter which had not been notified
Search/Exam
Nov 24, 2020
Nov 20, 2020
Communication to designated inventor
Search/Exam
Nov 20, 2020
Communication to designated inventor
Search/Exam
Nov 20, 2020
Communication to designated inventor
Search/Exam
Nov 20, 2020
Communication to designated inventor
Search/Exam
Nov 20, 2020
Communication to designated inventor
Search/Exam
Nov 17, 2020
Priority search results copy provided by EPO
Search/Exam
Nov 13, 2020
(Electronic) Receipt
Search/Exam
Nov 13, 2020
Request for entry into the European phase
Search/Exam
Nov 2, 2020
Aug 28, 2020
Information on entry into European phase
Search/Exam
Nov 11, 2019
Oct 24, 2019
Copy of the international search report
Search/Exam
Oct 24, 2019
Published international application - A1
Search/Exam
Jul 12, 2019
ISR: cited documents
PCTISA
Jul 12, 2019
Jul 12, 2019
Jul 12, 2019
Apr 24, 2019
Apr 24, 2019
Apr 17, 2019
Apr 15, 2019
(Electronic) Receipt
PCTRO
Apr 15, 2019
Abstract
PCTRO
Apr 15, 2019
Claims
PCTRO
Apr 15, 2019
Description
PCTRO
Apr 15, 2019
Apr 15, 2019
Drawings
PCTRO
Apr 15, 2019
Apr 15, 2019