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The patent EP3356307 was granted to United States Gypsum on Feb 24, 2021. The application was filed on Jun 23, 2016 under application number EP16736335A. 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 |
|---|---|---|---|
| INNOSPEC | Nov 23, 2021 | APPLEYARD LEES | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | US2007048490 |
| DESCRIPTION | US2010247937 |
| DESCRIPTION | US2012168527 |
| DESCRIPTION | US2012170403 |
| DESCRIPTION | US2014113124 |
| DESCRIPTION | US2015010767 |
| DESCRIPTION | US2017022 |
| DESCRIPTION | US2080009 |
| DESCRIPTION | US3573947 |
| DESCRIPTION | US4203788 |
| DESCRIPTION | US4488909 |
| DESCRIPTION | US4504335 |
| DESCRIPTION | US4518652 |
| DESCRIPTION | US4916004 |
| DESCRIPTION | US6342284 |
| DESCRIPTION | US6409825 |
| DESCRIPTION | US6632550 |
| DESCRIPTION | US6815049 |
| DESCRIPTION | US6822033 |
| DESCRIPTION | US6869474 |
| DESCRIPTION | US6874930 |
| DESCRIPTION | US7364676 |
| DESCRIPTION | US7811685 |
| DESCRIPTION | US8070878 |
| DESCRIPTION | US8323785 |
| EXAMINATION | WO2016209942 |
| INTERNATIONAL-SEARCH-REPORT | FR2963002 |
| INTERNATIONAL-SEARCH-REPORT | JPH0350168 |
| INTERNATIONAL-SEARCH-REPORT | SU1291585 |
| INTERNATIONAL-SEARCH-REPORT | SU967996 |
| INTERNATIONAL-SEARCH-REPORT | US2007048490 |
| INTERNATIONAL-SEARCH-REPORT | US5643510 |
| OPPOSITION | EP0611734 |
| OPPOSITION | JP2003313059 |
| OPPOSITION | SU967996 |
| OPPOSITION | US2003010419 |
| OPPOSITION | US2008223258 |
| OPPOSITION | US2009169864 |
| OPPOSITION | US3394768 |
| OPPOSITION | US3926650 |
| OPPOSITION | US5643510 |
| OPPOSITION | US5714001 |
| OPPOSITION | US6342284 |
| OPPOSITION | US6632550 |
| OPPOSITION | US6774146 |
| OPPOSITION | US6815049 |
| OPPOSITION | WO2004083146 |
| OPPOSITION | WO2008150597 |
| OPPOSITION | WO2016209942 |
| OPPOSITION | WO2018226777 |
| OPPOSITION | WO9516515 |
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
Aug 18, 2025
(Electronic) Receipt
Appeal
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Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Mar 19, 2025
Annex
Appeal
Mar 19, 2025
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(Electronic) Receipt
Appeal
Aug 12, 2024
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Reply to appeal
Appeal
Apr 12, 2024
Apr 9, 2024
(Electronic) Receipt
Appeal
Apr 9, 2024
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Feb 13, 2024
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Feb 7, 2024
(Electronic) Receipt
Appeal
Feb 7, 2024
Feb 7, 2024
Notice of appeal
Appeal
Dec 13, 2023
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Means of redress
OPPO
Dec 11, 2023
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Authorisation
OPPO
Mar 2, 2022
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Dec 8, 2021
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Mar 8, 2021
Jan 28, 2021
Decision to grant a European patent
Search/Exam
Nov 19, 2020
Filing of the translations of the claims
Search/Exam
Nov 19, 2020
French translation of claims
Search/Exam
Nov 19, 2020
German translation of the claims
Search/Exam
Nov 17, 2020
Filing of the translations of the claims
Search/Exam
Nov 17, 2020
French translation of claims
Search/Exam
Nov 17, 2020
German translation of the claims
Search/Exam
Sep 23, 2020
Sep 23, 2020
Sep 23, 2020
Intention to grant (signatures)
Search/Exam
Sep 23, 2020
Text intended for grant (clean copy)
Search/Exam
Sep 23, 2020
Jul 3, 2020
(Electronic) Receipt
Search/Exam
Jul 3, 2020
Amended claims with annotations
Search/Exam
Jul 3, 2020
Amended description with annotations
Search/Exam
Jul 3, 2020
Claims
Search/Exam
Jul 3, 2020
Description
Search/Exam
Jul 3, 2020
Letter accompanying subsequently filed items
Search/Exam
Jul 3, 2020
May 4, 2020
Annex to the communication
Search/Exam
May 4, 2020
Communication from the Examining Division
Search/Exam
Jan 15, 2020
(Electronic) Receipt
Search/Exam
Jan 15, 2020
Amended claims with annotations
Search/Exam
Jan 15, 2020
Claims
Search/Exam
Jan 15, 2020
Letter accompanying subsequently filed items
Search/Exam
Jan 15, 2020
Nov 6, 2019
Nov 4, 2019
Oct 31, 2019
Jul 5, 2019
Annex to the communication
Search/Exam
Jul 5, 2019
Communication from the Examining Division
Search/Exam
Jul 1, 2019
Examination started
Search/Exam
Jul 11, 2018
May 30, 2018
May 25, 2018
May 14, 2018
Communication to designated inventor
Search/Exam
May 14, 2018
Communication to designated inventor
Search/Exam
May 14, 2018
Communication to designated inventor
Search/Exam
May 11, 2018
May 8, 2018
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May 2, 2018
Apr 30, 2018
(Electronic) Receipt
Search/Exam
Apr 30, 2018
Apr 30, 2018
Amended claims with annotations
Search/Exam
Apr 30, 2018
Apr 30, 2018
Amended description with annotations
Search/Exam
Apr 30, 2018
Request for entry into the European phase
Search/Exam
Apr 18, 2018
Apr 11, 2018
Apr 11, 2018
Notification of the recording of a change
Search/Exam
Feb 9, 2018
Information on entry into European phase
Search/Exam
Apr 25, 2017
Apr 25, 2017
Apr 25, 2017
Apr 6, 2017
Copy of the international search report
Search/Exam
Apr 6, 2017
Published international application - A1
Search/Exam
Oct 4, 2016
ISR: cited documents
PCTISA
Sep 29, 2016
Sep 29, 2016
Sep 29, 2016
Jul 22, 2016
Jul 1, 2016
Abstract
PCTISA
Jul 1, 2016
Annex
PCTISA
Jul 1, 2016
Claims
PCTISA
Jul 1, 2016
Jul 1, 2016
Description
PCTISA
Jul 1, 2016
Drawings
PCTISA
Jul 1, 2016
Jul 1, 2016
Jul 1, 2016
Jul 1, 2016