Piston Ring

Patent No. EP2551560 (titled "Piston Ring") was filed by Nippon Piston Ring on Feb 25, 2009. The application was issued on Dec 3, 2025.

Patent Family

Statuses, jurisdictions and citation links are shared on request.

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
HOFFMANN EITLE	Apr 8, 2015	HOFFMANN EITLE

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

Nov 6, 2025
Decision to maintain the European patent in amended form
Nov 6, 2025
Decision to maintain the European patent in amended form
Oct 28, 2025
(Electronic) Receipt
Oct 28, 2025
Filing of the translation of the amended claims
Oct 28, 2025
French translation of claims
Oct 28, 2025
German translation of the claims
Oct 28, 2025
Letter accompanying subsequently filed items
Sep 15, 2025
Communication of bibliographic data
Sep 15, 2025
Communication to opponent concerning maintenance
Sep 15, 2025
Communication with request to file translations
Sep 10, 2025
Maintenance of the patent with the documents specified in the final decision
May 22, 2025
Brief communication - Opposition proceedings
May 22, 2025
Brief communication - Opposition proceedings
May 22, 2025
Decision of the Opposition Division and instruction
May 22, 2025
Druckexemplar in opposition procedure
May 22, 2025
Grounds for the decision (Annex) - opposition
May 22, 2025
Interlocutory decision in opposition proceedings
May 22, 2025
Interlocutory decision in opposition proceedings
May 22, 2025
Means of redress
May 8, 2024
Annex to the communication - opposition
May 8, 2024
Brief communication - Opposition proceedings
May 8, 2024
Brief communication - Opposition proceedings
May 8, 2024
Communication inviting the parties to file observations
May 8, 2024
Communication inviting the parties to file observations
Jun 26, 2023
Brief communication - Opposition proceedings
Jun 21, 2023
(Electronic) Receipt
Jun 21, 2023
Amended description with annotations
Jun 21, 2023
Description
Jun 21, 2023
Letter accompanying subsequently filed items
Jun 21, 2023
Reply to an examination report in opposition proceedings
May 22, 2023
Annex to the communication - opposition
May 22, 2023
Brief communication - Opposition proceedings
May 22, 2023
Brief communication - Opposition proceedings
May 22, 2023
Communication inviting the parties to file observations
May 22, 2023
Communication inviting the parties to file observations
Dec 6, 2022
Decision of the Board of Appeal
Dec 6, 2022
Decision of the Board of Appeal
Dec 6, 2022
F3032 Notification(s) of the decision
Dec 6, 2022
F3032 Notification(s) of the decision
Oct 10, 2022
F3013 Oral Proceedings: Forwarding minutes
Oct 10, 2022
F3013 Oral Proceedings: Forwarding minutes
Oct 10, 2022
F3316 Oral Proceedings: Minutes (Appellant: Opponent)
Oct 10, 2022
F3316 Oral Proceedings: Minutes (Appellant: Opponent)
Sep 26, 2022
Advice of delivery
Sep 26, 2022
F3017 Oral Proceedings: Notification of cancellation/postponing
Sep 26, 2022
F3017 Oral Proceedings: Notification of cancellation/postponing
Sep 26, 2022
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Sep 26, 2022
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Sep 22, 2022
F3345 Forwarding of submissions to parties
Sep 20, 2022
(Electronic) Receipt
Sep 20, 2022
Letter dealing with oral proceedings
Sep 20, 2022
Letter regarding the opposition procedure (no time limit)
Sep 14, 2022
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Sep 14, 2022
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Sep 14, 2022
Oral proceedings: change of venue
Sep 14, 2022
Oral proceedings: change of venue
Sep 2, 2022
F3345 Forwarding of submissions to parties
Sep 1, 2022
F3345 Forwarding of submissions to parties
Aug 30, 2022
(Electronic) Receipt
Aug 30, 2022
Letter accompanying subsequently filed items
Aug 30, 2022
Request for interpreters during oral proceedings
Aug 29, 2022
(Electronic) Receipt
Aug 29, 2022
Letter accompanying subsequently filed items
Aug 29, 2022
Request for interpreters during oral proceedings
Aug 25, 2022
F3345 Forwarding of submissions to parties
Aug 22, 2022
(Electronic) Receipt
Aug 22, 2022
Letter accompanying subsequently filed items
Aug 22, 2022
Letter dealing with oral proceedings during the appeal procedure
May 30, 2022
F3345 Forwarding of submissions to parties
May 24, 2022
(Electronic) Receipt
May 24, 2022
Letter dealing with oral proceedings during the appeal procedure
May 24, 2022
Letter regarding the opposition procedure (no time limit)
Mar 10, 2022
F3345 Forwarding of submissions to parties
Mar 7, 2022
(Electronic) Receipt
Mar 7, 2022
Letter accompanying subsequently filed items
Mar 7, 2022
Letter dealing with oral proceedings during the appeal procedure
Nov 5, 2021
Advice of delivery
Nov 4, 2021
F3011.1 Oral Proceedings: summons
Nov 4, 2021
F3011.1 Oral Proceedings: summons
Nov 4, 2021
F3350 Communication regarding oral proceedings (art. 15 Rules of Procedure of the Boards of Appeal)
Oct 29, 2021
F3010 Oral proceedings: order for summons
Jun 28, 2021
F3345 Forwarding of submissions to parties
Jun 21, 2021
(Electronic) Receipt
Jun 21, 2021
Letter accompanying subsequently filed items
Jun 21, 2021
Letter relating to Appeal Procedure
Apr 1, 2021
F3056 Communication: Change of Board due to the technical nature of the appeal
Apr 1, 2021
F3056 Communication: Change of Board due to the technical nature of the appeal
Mar 29, 2021
Composition of the board (T)
Mar 23, 2021
F3313 Order: change of Board due to the technical aspects of the appeal
Feb 25, 2021
F3345 Forwarding of submissions to parties
Feb 5, 2021
(Electronic) Receipt
Feb 5, 2021
Citation in appeal procedure - 014
Feb 5, 2021
Letter regarding the opposition procedure (no time limit)
Feb 5, 2021
Letter relating to Appeal Procedure
Nov 25, 2020
F3345 Forwarding of submissions to parties
Nov 18, 2020
(Electronic) Receipt
Nov 18, 2020
Letter accompanying subsequently filed items
Nov 18, 2020
Letter relating to Appeal Procedure
Jul 6, 2020
F3345 Forwarding of submissions to parties
Jun 19, 2020
(Electronic) Receipt
Jun 19, 2020
Citation in appeal procedure - 012
Jun 19, 2020
Citation in appeal procedure - 013
Jun 19, 2020
Letter accompanying subsequently filed items
Jun 19, 2020
Letter relating to Appeal Procedure
Mar 16, 2020
F3345 Forwarding of submissions to parties
Mar 10, 2020
(Electronic) Receipt
Mar 10, 2020
Letter accompanying subsequently filed items
Mar 10, 2020
Letter relating to Appeal Procedure
Dec 19, 2019
F3345 Forwarding of submissions to parties
Dec 10, 2019
(Electronic) Receipt
Dec 10, 2019
Letter accompanying subsequently filed items
Dec 10, 2019
Letter relating to Appeal Procedure
Aug 21, 2019
F3345 Forwarding of submissions to parties
Aug 16, 2019
(Electronic) Receipt
Aug 16, 2019
Auxiliary request during appeals procedure - 01
Aug 16, 2019
Auxiliary request during appeals procedure - 02
Aug 16, 2019
Letter accompanying subsequently filed items
Aug 16, 2019
Reply to appeal
May 21, 2019
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
May 15, 2019
(Electronic) Receipt
May 15, 2019
Citation in appeal procedure - 010
May 15, 2019
Citation in appeal procedure - 011
May 15, 2019
Letter accompanying subsequently filed items
May 15, 2019
Statement of grounds of appeal
Mar 13, 2019
F3204 Communication of the file number to the parties
Mar 13, 2019
F3204 Communication of the file number to the parties
Mar 7, 2019
(Electronic) Receipt
Mar 7, 2019
Letter accompanying subsequently filed items
Mar 7, 2019
Notice of appeal
Mar 7, 2019
Processing of an appeal
Jan 10, 2019
Advice of delivery
Jan 10, 2019
Advice of delivery
Jan 10, 2019
Advice of delivery
Jan 8, 2019
Advice of delivery
Jan 7, 2019
Acknowledgement of a document
Jan 7, 2019
Acknowledgement of a document
Jan 7, 2019
Annex to the communication - opposition
Jan 7, 2019
Decision of the Opposition Division and instruction
Jan 7, 2019
Decision of the Opposition Division and instruction
Jan 7, 2019
Decision rejecting the opposition
Jan 7, 2019
Grounds for the decision (Annex) - opposition
Jan 7, 2019
Internal form - Opposition/addressees
Jan 7, 2019
Internal form - Opposition/addressees
Jan 7, 2019
Means of redress
Jan 7, 2019
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Jan 7, 2019
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Jan 7, 2019
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Jan 7, 2019
Provision of a copy of the minutes - opposition procedure
Jan 7, 2019
Scanned annex to a communication - opposition procedure
Dec 11, 2018
Information about the result of oral proceedings
Oct 16, 2018
Brief communication - Opposition proceedings
Oct 10, 2018
(Electronic) Receipt
Oct 10, 2018
Brief communication - Opposition proceedings
Oct 10, 2018
Brief communication - Opposition proceedings
Oct 10, 2018
Request for interpreters during oral proceedings
Oct 4, 2018
(Electronic) Receipt
Oct 4, 2018
(Electronic) Receipt
Oct 4, 2018
Amended claims with annotations
Oct 4, 2018
Amended claims with annotations
Oct 4, 2018
Citation in opposition procedure
Oct 4, 2018
Claims
Oct 4, 2018
Claims
Oct 4, 2018
Claims
Oct 4, 2018
Letter accompanying subsequently filed items
Oct 4, 2018
Letter accompanying subsequently filed items
Oct 4, 2018
Non-patent literature cited during the opposition procedure
Oct 4, 2018
Request for interpreters during oral proceedings
Oct 4, 2018
Written submission in preparation to/during oral proceedings
Oct 4, 2018
Written submission in preparation to/during oral proceedings
May 30, 2018
Advice of delivery
May 29, 2018
Advice of delivery
May 29, 2018
Advice of delivery
May 28, 2018
Advice of delivery
May 25, 2018
Annex to the communication - opposition
May 25, 2018
Information concerning oral proceedings
May 25, 2018
Preparation for oral proceedings
May 25, 2018
Summons to attend oral proceedings
May 25, 2018
Summons to attend oral proceedings
Aug 1, 2016
Request for change of opponent's representative
Jul 11, 2016
Brief communication - Opposition proceedings
Jul 11, 2016
Brief communication - Opposition proceedings
Jul 6, 2016
(Electronic) Receipt
Jul 6, 2016
General enquiry
Jul 6, 2016
Letter accompanying subsequently filed items
Jun 24, 2016
Annex to the communication - opposition
Jun 24, 2016
Communication inviting the parties to file observations
Jun 24, 2016
Communication inviting the parties to file observations
Jun 24, 2016
Internal form - Opposition/addressees
Sep 25, 2015
Brief communication - Opposition proceedings
Sep 15, 2015
Reply of the patent proprietor to the notice(s) of opposition
May 28, 2015
Submission concerning representation
May 19, 2015
Communication of a notice of opposition and request to file observations
May 19, 2015
Notice of further oppositions to opponent(s)
Apr 21, 2015
Communication of a notice of opposition - first information to patent proprietor
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Non-patent literature cited during the opposition procedure
Apr 8, 2015
Notice of opposition
Apr 8, 2015
Notice of opposition
Apr 8, 2015
Patent document cited during the opposition procedure
Apr 8, 2015
Patent document cited during the opposition procedure
Apr 8, 2015
Patent document cited during the opposition procedure
Apr 8, 2015
Payment of fees and costs
Jul 9, 2014
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Jun 13, 2014
Decision to grant a European patent
May 27, 2014
Filing of the translations of the claims
May 27, 2014
French translation of claims
May 27, 2014
German translation of the claims
May 26, 2014
Payment of fees and costs
Mar 6, 2014
Bibliographic data of the European patent application
Mar 6, 2014
Communication about intention to grant a European patent
Mar 6, 2014
Intention to grant (signatures)
Mar 6, 2014
Text intended for grant
Feb 28, 2014
Letter concerning fees and payments
Feb 28, 2014
Payment of fees and costs
Feb 26, 2014
Notification concerning the date of oral proceedings
Feb 19, 2014
Findings upon submissions relating to oral proceedings
Feb 11, 2014
Findings upon submissions relating to oral proceedings
Feb 7, 2014
Amended claims with annotations
Feb 7, 2014
Amended claims with annotations
Feb 7, 2014
Letter dealing with oral proceedings
Nov 25, 2013
Advice of delivery
Nov 25, 2013
Advice of delivery
Nov 22, 2013
Acknowledgement of a document
Nov 22, 2013
Annex to the communication
Nov 22, 2013
Preparation for oral proceedings
Nov 22, 2013
Summons to attend oral proceedings
Oct 15, 2013
Reply to communication from the Examining Division
Jul 16, 2013
Annex to the communication
Jul 16, 2013
Communication from the Examining Division
Jun 20, 2013
Amended claims filed after receipt of (European) search report
Jun 20, 2013
Amended claims with annotations
Jun 20, 2013
Amendments received before examination
Jun 20, 2013
Maintenance of the application
Feb 28, 2013
Payment of fees and costs
Feb 4, 2013
Invitation to confirm maintenance of the application and to correct deficiencies in the Written Opinion/amend application
Jan 30, 2013
Refund of fees
Jan 11, 2013
Notification of forthcoming publication
Jan 7, 2013
Communication regarding the transmission of the European search report
Jan 7, 2013
European search opinion
Jan 7, 2013
European search report
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Nov 30, 2012
Communication to designated inventor
Oct 9, 2012
Abstract
Oct 9, 2012
Claims
Oct 9, 2012
Description
Oct 9, 2012
Designation of inventor
Oct 9, 2012
Drawings
Oct 9, 2012
Request for grant of a European patent
Apr 27, 2009
Priority document (electronically transmitted)
Apr 27, 2009
Priority document (electronically transmitted)

EP2551560

NIPPON PISTON RING

Application Number: EP12006986A
Filing Date: Feb 25, 2009
Status: Patent Maintained As Amended; Oct 31, 2025
Publication Date: Dec 3, 2025
External Links: Slate, Register , Google Patents

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Dossier Documents

EP2551560