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Anti-Torque System For A Helicopter And Method For Controlling An Anti-Torque System For A Helicopter

Patent No. EP3501983 (titled "Anti-Torque System For A Helicopter And Method For Controlling An Anti-Torque System For A Helicopter") was filed by Leonardo on Dec 22, 2017. The application was issued on Aug 20, 2025.

Patent Summary

Patent Family

Patent Oppositions

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
BELL TEXTRON	Nov 4, 2020	BARKER BRETTELL

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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Jul 24, 2025
Decision to maintain the European patent in amended form
Jul 24, 2025
Decision to maintain the European patent in amended form
Jul 14, 2025
(Electronic) Receipt
Jul 14, 2025
French translation of claims
Jul 14, 2025
German translation of the claims
Jul 14, 2025
Letter accompanying subsequently filed items
Apr 17, 2025
Communication of bibliographic data
Apr 17, 2025
Communication to opponent concerning maintenance
Apr 17, 2025
Communication with request to file translations
Apr 16, 2025
Refund of fees
Apr 14, 2025
Refund of fees
Apr 10, 2025
F3324 Closure of the appeal proceedings: withdrawal of the appeal/ application/ opposition
Apr 10, 2025
F3324 Closure of the appeal proceedings: withdrawal of the appeal/ application/ opposition
Apr 9, 2025
Maintenance of the patent with the documents specified in the final decision
Apr 8, 2025
F3017 Oral Proceedings: Notification of cancellation/postponing
Apr 8, 2025
F3017 Oral Proceedings: Notification of cancellation/postponing
Apr 7, 2025
F3014 Oral Proceedings: Order cancelling/postponing
Mar 27, 2025
F3345 Forwarding of submissions to parties
Mar 26, 2025
(Electronic) Receipt
Mar 26, 2025
F3345 Forwarding of submissions to parties
Mar 26, 2025
Letter accompanying subsequently filed items
Mar 26, 2025
Withdrawal of an appeal
Mar 25, 2025
(Electronic) Receipt
Mar 25, 2025
Letter accompanying subsequently filed items
Mar 25, 2025
Withdrawal of an appeal
Feb 27, 2025
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Feb 27, 2025
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Nov 22, 2024
(Electronic) Receipt
Oct 22, 2024
F3011.2 Oral Proceedings: Summons VICO
Oct 22, 2024
F3011.2 Oral Proceedings: Summons VICO
Oct 17, 2024
F3010 Oral proceedings: order for summons
May 23, 2024
Composition of the board (T)
Sep 14, 2023
F3345 Forwarding of submissions to parties
Sep 8, 2023
(Electronic) Receipt
Sep 8, 2023
Letter accompanying subsequently filed items
Sep 8, 2023
Reply to appeal
Sep 7, 2023
Communication of amended entries concerning the representative
Sep 6, 2023
F3345 Forwarding of submissions to parties
Sep 5, 2023
(Electronic) Receipt
Sep 5, 2023
Letter accompanying subsequently filed items
Sep 5, 2023
Reply to appeal
Aug 31, 2023
Submission concerning change of applicant's representative
May 8, 2023
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
May 8, 2023
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
Apr 28, 2023
(Electronic) Receipt
Apr 28, 2023
Auxiliary request during appeals procedure - 01
Apr 28, 2023
Auxiliary request during appeals procedure - 02
Apr 28, 2023
Claims
Apr 28, 2023
Letter accompanying subsequently filed items
Apr 28, 2023
Statement of grounds of appeal
Apr 20, 2023
(Electronic) Receipt
Apr 20, 2023
Letter accompanying subsequently filed items
Apr 20, 2023
Statement of grounds of appeal
Mar 3, 2023
F3204 Communication of the file number to the parties
Mar 3, 2023
F3204 Communication of the file number to the parties
Feb 28, 2023
(Electronic) Receipt
Feb 28, 2023
Letter accompanying subsequently filed items
Feb 28, 2023
Notice of appeal
Feb 22, 2023
F3204 Communication of the file number to the parties
Feb 22, 2023
F3204 Communication of the file number to the parties
Feb 16, 2023
(Electronic) Receipt
Feb 16, 2023
Letter accompanying subsequently filed items
Feb 16, 2023
Notice of appeal
Dec 30, 2022
(Electronic) Receipt
Dec 30, 2022
Advice of delivery
Dec 30, 2022
Letter accompanying subsequently filed items
Dec 21, 2022
(Electronic) Receipt
Dec 21, 2022
Advice of delivery
Dec 21, 2022
Letter accompanying subsequently filed items
Dec 20, 2022
Annex to the communication - opposition
Dec 20, 2022
Decision of the Opposition Division and instruction
Dec 20, 2022
Druckexemplar in opposition procedure
Dec 20, 2022
Grounds for the decision (Annex) - opposition
Dec 20, 2022
Interlocutory decision in opposition proceedings
Dec 20, 2022
Interlocutory decision in opposition proceedings
Dec 20, 2022
Means of redress
Dec 20, 2022
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Dec 20, 2022
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Dec 20, 2022
Provision of a copy of the minutes - opposition procedure
Dec 20, 2022
Provision of a copy of the minutes - opposition procedure
Dec 20, 2022
Scanned annex to a communication - opposition procedure
Dec 20, 2022
Scanned annex to a communication - opposition procedure
Dec 20, 2022
Transmittal of decision / summons - opposition
Dec 20, 2022
Transmittal of decision / summons - opposition
Nov 22, 2022
Annexes in respect of a client data request
Nov 22, 2022
Annexes in respect of a client data request
Nov 22, 2022
Submission concerning representation
Nov 22, 2022
Submission concerning representation
Nov 8, 2022
Information about the result of oral proceedings
Sep 15, 2022
Brief communication - Opposition proceedings
Sep 8, 2022
(Electronic) Receipt
Sep 8, 2022
Auxiliary request during Opposition procedure - 01
Sep 8, 2022
Auxiliary request during Opposition procedure - 02
Sep 8, 2022
Brief communication - Opposition proceedings
Sep 8, 2022
Letter accompanying subsequently filed items
Sep 8, 2022
Main request during Opposition procedure
Sep 8, 2022
Written submission in preparation to/during oral proceedings
Sep 1, 2022
(Electronic) Receipt
Sep 1, 2022
Letter accompanying subsequently filed items
Sep 1, 2022
Written submission in preparation to/during oral proceedings
Jun 7, 2022
(Electronic) Receipt
Jun 7, 2022
Notification concerning the date of oral proceedings
Jun 7, 2022
Notification concerning the date of oral proceedings
Oct 29, 2021
(Electronic) Receipt
Oct 29, 2021
Advice of delivery
Oct 22, 2021
Annex to the communication - opposition
Oct 22, 2021
Information concerning oral proceedings
Oct 22, 2021
Summons to attend oral proceedings
Oct 22, 2021
Summons to attend oral proceedings
Oct 22, 2021
Transmittal of decision / summons - opposition
Oct 22, 2021
Transmittal of decision / summons - opposition
Aug 23, 2021
Brief communication - Opposition proceedings
Apr 20, 2021
Brief communication - Opposition proceedings
Apr 16, 2021
Communication of amended entries
Apr 14, 2021
(Electronic) Receipt
Apr 14, 2021
Auxiliary request during Opposition procedure - 01
Apr 14, 2021
Auxiliary request during Opposition procedure - 02
Apr 14, 2021
Auxiliary request during Opposition procedure - 03
Apr 14, 2021
Description
Apr 14, 2021
Letter accompanying subsequently filed items
Apr 14, 2021
Main request during Opposition procedure
Apr 14, 2021
Reply of the patent proprietor to the notice(s) of opposition
Mar 26, 2021
Request concerning representative opponent
Dec 14, 2020
Communication of a notice of opposition and request to file observations
Dec 14, 2020
Notice of further oppositions to opponent(s)
Dec 7, 2020
(Electronic) Receipt
Dec 7, 2020
Citation in opposition procedure - 010
Dec 7, 2020
Citation in opposition procedure - 011
Dec 7, 2020
Consolidated list of cited opposition documents
Dec 7, 2020
Letter accompanying subsequently filed items
Dec 7, 2020
Letter regarding the opposition procedure (no time limit)
Nov 11, 2020
Communication of a notice of opposition - first information to patent proprietor
Nov 11, 2020
Request for documents
Nov 4, 2020
(Electronic) Receipt
Nov 4, 2020
Citation in opposition procedure - 001
Nov 4, 2020
Citation in opposition procedure - 002
Nov 4, 2020
Citation in opposition procedure - 003
Nov 4, 2020
Citation in opposition procedure - 004
Nov 4, 2020
Citation in opposition procedure - 005
Nov 4, 2020
Citation in opposition procedure - 006
Nov 4, 2020
Citation in opposition procedure - 007
Nov 4, 2020
Citation in opposition procedure - 008
Nov 4, 2020
Citation in opposition procedure - 009
Nov 4, 2020
Notice of opposition
Nov 4, 2020
Notice of opposition
Feb 17, 2020
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Jan 10, 2020
Decision to grant a European patent
Nov 19, 2019
(Electronic) Receipt
Nov 19, 2019
Filing of the translations of the claims
Nov 19, 2019
French translation of claims
Nov 19, 2019
German translation of the claims
Jul 26, 2019
Bibliographic data of the European patent application
Jul 26, 2019
Communication about intention to grant a European patent
Jul 26, 2019
Intention to grant (signatures)
Jul 26, 2019
Text intended for grant (clean copy)
Jul 26, 2019
Text intended for grant (version for approval)
Jul 1, 2019
Information about publication, reminder payment of designation fee, response to extended European search report, if applicable
May 29, 2019
Notification of forthcoming publication
Mar 26, 2019
Examination started
Sep 10, 2018
(Electronic) Receipt
Sep 10, 2018
Abstract
Sep 10, 2018
Abstract
Sep 10, 2018
Amended claims filed after receipt of (European) search report
Sep 10, 2018
Amended claims with annotations
Sep 10, 2018
Amended description filed after receipt of (European) search report
Sep 10, 2018
Amended description with annotations
Sep 10, 2018
Amendments received before examination
Sep 10, 2018
Letter accompanying subsequently filed items
Jun 12, 2018
Communication regarding the transmission of the European search report
Jun 12, 2018
European search opinion
Jun 12, 2018
European search report
Jun 12, 2018
Information on Search Strategy
Jun 4, 2018
Search started
Feb 22, 2018
(Electronic) Receipt
Feb 22, 2018
Abstract
Feb 22, 2018
Claims
Feb 22, 2018
Description
Feb 22, 2018
Letter accompanying subsequently filed items
Feb 14, 2018
Communication to designated inventor
Feb 14, 2018
Communication to designated inventor
Feb 14, 2018
Communication to designated inventor
Feb 14, 2018
Communication to designated inventor
Dec 22, 2017
Acknowledgement of receipt of electronic submission of the request for grant of a European patent
Dec 22, 2017
Designation of inventor
Dec 22, 2017
Drawings
Dec 22, 2017
Request for grant of a European patent
Dec 22, 2017
Specification filed by fax and/or in non-official language

EP3501983

LEONARDO

Application Number: EP17210094A
Filing Date: Dec 22, 2017
Status: Patent Maintained As Amended; Jul 18, 2025
Publication Date: Aug 20, 2025
External Links: Slate, EP3501983B2, Google Patents