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The patent EP3420291 was granted to Sirona Dental Systems on Mar 25, 2020. The application was filed on Feb 22, 2017 under application number EP17708713A. 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 |
|---|---|---|---|
| IVOCLAR VIVADENT | Dec 22, 2020 | BALDUS | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE102006032655 |
| DESCRIPTION | DE102012213279 |
| DESCRIPTION | DE102013226497 |
| INTERNATIONAL-SEARCH-REPORT | DE19606493 |
| INTERNATIONAL-SEARCH-REPORT | EP0775883 |
| INTERNATIONAL-SEARCH-REPORT | EP1593922 |
| INTERNATIONAL-SEARCH-REPORT | US8109761 |
| INTERNATIONAL-SEARCH-REPORT | WO2013068312 |
| INTERNATIONAL-SEARCH-REPORT | WO2014016320 |
| OPPOSITION | CA1327465 |
| OPPOSITION | EP0775883 |
| OPPOSITION | EP2101133 |
| OPPOSITION | KR101179501B |
| OPPOSITION | US5977293 |
| OPPOSITION | US8109761 |
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
Feb 20, 2025
Authorisation
Appeal
Feb 20, 2025
Jul 25, 2024
Jul 19, 2024
(Electronic) Receipt
Appeal
Jul 19, 2024
Jul 19, 2024
Reply to appeal
Appeal
Mar 21, 2024
Mar 18, 2024
(Electronic) Receipt
Appeal
Mar 18, 2024
Mar 18, 2024
Mar 18, 2024
Mar 18, 2024
Mar 3, 2024
Jan 25, 2024
Jan 25, 2024
Jan 22, 2024
(Electronic) Receipt
Appeal
Jan 22, 2024
Jan 22, 2024
Notice of appeal
Appeal
Dec 20, 2023
Dec 6, 2023
Nov 28, 2023
Nov 28, 2023
Nov 28, 2023
Nov 28, 2023
Nov 28, 2023
Nov 28, 2023
Means of redress
OPPO
Nov 28, 2023
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Description
OPPO
Oct 27, 2023
Description
OPPO
Oct 27, 2023
Oct 27, 2023
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Oct 12, 2023
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Annex
OPPO
Feb 9, 2023
Feb 9, 2023
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Dec 21, 2022
Letter accompanying subsequently filed items
Search/Exam
Dec 8, 2022
Aug 16, 2022
Aug 4, 2022
Aug 4, 2022
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Description
OPPO
Aug 10, 2021
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Apr 6, 2020
Feb 27, 2020
Decision to grant a European patent
Search/Exam
Jan 15, 2020
(Electronic) Receipt
Search/Exam
Jan 15, 2020
English translation of the claims
Search/Exam
Jan 15, 2020
Filing of the translations of the claims
Search/Exam
Jan 15, 2020
French translation of claims
Search/Exam
Jan 15, 2020
Letter accompanying subsequently filed items
Search/Exam
Sep 24, 2019
Sep 24, 2019
Sep 24, 2019
Intention to grant (signatures)
Search/Exam
Sep 24, 2019
Text intended for grant (clean copy)
Search/Exam
Sep 24, 2019
Aug 19, 2019
Examination started
Search/Exam
Aug 13, 2019
Aug 6, 2019
Aug 5, 2019
Jun 12, 2019
May 13, 2019
May 10, 2019
Authorisation
Search/Exam
Jan 9, 2019
Letter concerning the inventor
Search/Exam
Dec 5, 2018
Nov 26, 2018
Nov 1, 2018
Letter which had not been notified
Search/Exam
Sep 28, 2018
Communication to designated inventor
Search/Exam
Aug 22, 2018
(Electronic) Receipt
Search/Exam
Aug 22, 2018
Aug 22, 2018
Amended claims with annotations
Search/Exam
Aug 22, 2018
Aug 22, 2018
Amended description with annotations
Search/Exam
Aug 22, 2018
Aug 22, 2018
Amended drawings with annotations
Search/Exam
Aug 22, 2018
Amendments received before examination
Search/Exam
Aug 22, 2018
Aug 22, 2018
Aug 22, 2018
Priority search results
Search/Exam
Aug 22, 2018
Request for entry into the European phase
Search/Exam
Jul 4, 2018
Information on entry into European phase
Search/Exam
Jun 18, 2018
Jun 18, 2018
Jun 18, 2018
Jun 18, 2018
Jun 18, 2018
Apr 4, 2018
Apr 4, 2018
Feb 13, 2018
Written opinion
PCT2
Feb 13, 2018
Feb 13, 2018
Jan 16, 2018
Notification of election of EPO
Search/Exam
Jan 3, 2018
Dec 13, 2017
Dec 13, 2017
PCT demand form
PCT2
Dec 13, 2017
Dec 13, 2017
Dec 13, 2017
Dec 13, 2017
Sep 22, 2017
Aug 31, 2017
Copy of the international search report
Search/Exam
Aug 31, 2017
Copy of the international search report
Search/Exam
Aug 31, 2017
Published international application - A1
Search/Exam
Jun 21, 2017
Jun 21, 2017
RO101 Declaration
PCTRO
May 17, 2017
ISR: cited documents
PCTISA
May 17, 2017
May 16, 2017
May 16, 2017
May 16, 2017
Mar 17, 2017
Mar 13, 2017
Mar 1, 2017
Feb 22, 2017
(Electronic) Receipt
PCTRO
Feb 22, 2017
Abstract
PCTRO
Feb 22, 2017
Claims
PCTRO
Feb 22, 2017
Description
PCTRO
Feb 22, 2017
Feb 22, 2017
Drawings
PCTRO
Feb 22, 2017