Ageing-Stable Sealing Sheet

Patent No. EP4225575 (titled "Ageing-Stable Sealing Sheet") was filed by Drken on Dec 16, 2021. The application was issued on Jun 12, 2024.

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
SML MASCHINENGESELLSCHAFT	Mar 3, 2025	GOSDIN
SML MASCHINENGESELLSCHAFT	Mar 3, 2025	GOSDIN

Dossier Documents

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 22, 2025
Communication to the parties concerning the termination of the opposition proceedings (proprietor)
Sep 17, 2025
Decision to discontinue the opposition proceedings
Sep 10, 2025
Brief communication - Opposition proceedings
Sep 10, 2025
Brief communication - Opposition proceedings
Sep 4, 2025
(Electronic) Receipt
Sep 4, 2025
Letter accompanying subsequently filed items
Sep 4, 2025
Withdrawal of an opposition
Jul 23, 2025
Brief communication - Opposition proceedings
Jul 18, 2025
(Electronic) Receipt
Jul 18, 2025
Citation in opposition procedure - 013
Jul 18, 2025
Citation in opposition procedure - 014
Jul 18, 2025
Consolidated list of cited opposition documents
Jul 18, 2025
Letter accompanying subsequently filed items
Jul 18, 2025
Reply of the patent proprietor to the notice(s) of opposition
Mar 24, 2025
Communication of a notice of opposition and request to file observations
Mar 24, 2025
Notice of further oppositions to opponent(s)
Mar 8, 2025
(Electronic) Receipt
Mar 8, 2025
Letter accompanying subsequently filed items
Mar 8, 2025
Letter concerning fees and payments
Mar 7, 2025
Communication indicating deficiencies in the notice of opposition which may be remedied within the opposition period
Mar 6, 2025
Communication of a notice of opposition - first information to patent proprietor
Mar 3, 2025
(Electronic) Receipt
Mar 3, 2025
Citation in opposition procedure - 001
Mar 3, 2025
Citation in opposition procedure - 002
Mar 3, 2025
Citation in opposition procedure - 003
Mar 3, 2025
Citation in opposition procedure - 004
Mar 3, 2025
Citation in opposition procedure - 005
Mar 3, 2025
Citation in opposition procedure - 006
Mar 3, 2025
Citation in opposition procedure - 007
Mar 3, 2025
Citation in opposition procedure - 008
Mar 3, 2025
Citation in opposition procedure - 009
Mar 3, 2025
Citation in opposition procedure - 010
Mar 3, 2025
Citation in opposition procedure - 011
Mar 3, 2025
Citation in opposition procedure - 012
Mar 3, 2025
Letter accompanying subsequently filed items
Mar 3, 2025
Notice of opposition
Mar 3, 2025
Notice of opposition
Jun 25, 2024
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
May 16, 2024
Decision to grant a European patent
May 6, 2024
(Electronic) Receipt
May 6, 2024
English translation of the claims
May 6, 2024
Filing of the translations of the claims
May 6, 2024
French translation of claims
May 6, 2024
Letter accompanying subsequently filed items
Apr 10, 2024
Annex to the communication about intention to grant a European patent
Apr 10, 2024
Bibliographic data of the European patent application
Apr 10, 2024
Communication about intention to grant a European patent
Apr 10, 2024
Intention to grant (signatures)
Apr 10, 2024
Text intended for grant (clean copy)
Apr 10, 2024
Text intended for grant (version for approval)
Mar 14, 2024
(Electronic) Receipt
Mar 14, 2024
Amended claims with annotations
Mar 14, 2024
Amended description with annotations
Mar 14, 2024
Claims
Mar 14, 2024
Description
Mar 14, 2024
Letter accompanying subsequently filed items
Mar 14, 2024
Reply to communication from the Examining Division
Feb 20, 2024
Communication for party to proceedings/third party
Feb 16, 2024
Annex to the communication
Feb 16, 2024
Consultation by telephone/in person (with time limit)
Feb 16, 2024
Result of consultation by telephone/in person
Feb 15, 2024
Transmittal of third party observations to applicant
Feb 9, 2024
(Electronic) Receipt
Feb 9, 2024
Amended description with annotations
Feb 9, 2024
Description
Feb 9, 2024
Letter accompanying subsequently filed items
Feb 9, 2024
Observations by third parties
Feb 9, 2024
Request for correction/amendment of the text proposed for grant sent from 01.04.2012
Oct 20, 2023
Annex to the communication about intention to grant a European patent
Oct 20, 2023
Bibliographic data of the European patent application
Oct 20, 2023
Communication about intention to grant a European patent
Oct 20, 2023
Intention to grant (signatures)
Oct 20, 2023
Text intended for grant (clean copy)
Oct 20, 2023
Text intended for grant (version for approval)
Oct 4, 2023
Examination started
Aug 14, 2023
Annexes to the international preliminary examination report
Aug 14, 2023
Copy of the international preliminary examination report
Jul 31, 2023
(Electronic) Receipt
Jul 31, 2023
Letter accompanying subsequently filed items
Jul 31, 2023
Priority search results
Jul 31, 2023
Reply to invitation to file a copy of priority search results
Jul 21, 2023
Invitation to file a copy of search results(priority)
Jul 19, 2023
Notification on forthcoming publication of bibliographic data
May 22, 2023
Confirmation of effective date of early entry
May 10, 2023
(Electronic) Receipt
May 10, 2023
(Electronic) Receipt
May 10, 2023
Amended description filed after receipt of (European) search report
May 10, 2023
Amended description with annotations
May 10, 2023
Letter accompanying subsequently filed items
May 10, 2023
Matter concerning the application
May 10, 2023
Request for entry into the European phase
Apr 20, 2023
Annex to International preliminary examination report
Apr 20, 2023
International preliminary examination report
Apr 20, 2023
International preliminary examination report - free text sheet
Apr 20, 2023
International preliminary examination report - points I-VIII
Apr 20, 2023
Transmittal of International Preliminary Examination Report
Dec 9, 2022
(Electronic) Receipt
Dec 9, 2022
Letter regarding PCTII procedure
Dec 9, 2022
PCT(IPEA): Amended sheet - claims
Dec 9, 2022
PCT(IPEA): Amended sheet - claims
Dec 9, 2022
Reply to communication PCT/IPEA/408
Oct 13, 2022
Notification of election of EPO
Oct 10, 2022
Written opinion
Oct 10, 2022
Written opinion - free text sheet
Oct 10, 2022
Written opinion - points I-VIII
Oct 4, 2022
Amendments of documents (Article 19 PCT) (without attachments)
Sep 16, 2022
Notification of receipt of demand
Sep 9, 2022
(Electronic) Receipt
Sep 9, 2022
PCT demand form
Sep 9, 2022
PCT(IPEA): Amended sheet - claims
Sep 9, 2022
PCT(IPEA): Amended sheet - claims
Sep 9, 2022
Payment of fees and costs
Sep 9, 2022
Reply to International Search Opinion
Sep 5, 2022
Priority document (electronically transmitted)
Aug 18, 2022
Copy of the international search report
Aug 18, 2022
Copy of the international search report
Aug 18, 2022
Published international application - A1
Jan 25, 2022
Notification of the international application number and of the international filing date
Jan 4, 2022
Incoming letter related to PCT RO
Dec 16, 2021
(Electronic) Receipt
Dec 16, 2021
Abstract
Dec 16, 2021
Claims
Dec 16, 2021
Description
Dec 16, 2021
Document concerning fees and payments
Dec 16, 2021
Drawings
Dec 16, 2021
Electronic request for grant of an International application

EP4225575

DRKEN

Application Number: EP21840824A
Filing Date: Dec 16, 2021
Status: Granted And Under Opposition; May 10, 2024
Publication Date: Jun 12, 2024
External Links: Slate, Register , Google Patents

IP Verse

Ageing-Stable Sealing Sheet

Patent Summary

Patent Family

Patent Oppositions (2)

Dossier Documents

EP4225575