Cd33 Specific Chimeric Antigen Receptors For Cancer Immunotherapy

Patent No. EP3126390 (titled "Cd33 Specific Chimeric Antigen Receptors For Cancer Immunotherapy") was filed by Cellectis on Apr 2, 2015. The application was issued on Jan 7, 2026.

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
WUESTHOFF & WUESTHOFF PATENTANWALTE PARTG MBB	Jul 14, 2020	WICHMANN

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 11, 2025
Decision to maintain the European patent in amended form
Dec 11, 2025
Decision to maintain the European patent in amended form
Dec 3, 2025
(Electronic) Receipt
Dec 3, 2025
Filing of the translation of the amended claims
Dec 3, 2025
French translation of claims
Dec 3, 2025
German translation of the claims
Dec 3, 2025
Letter accompanying subsequently filed items
Sep 29, 2025
Communication of bibliographic data
Sep 29, 2025
Communication to opponent concerning maintenance
Sep 29, 2025
Communication with request to file translations
Sep 24, 2025
Maintenance of the patent with the documents specified in the final decision
Jun 23, 2025
Brief communication - Opposition proceedings
Jun 23, 2025
Brief communication - Opposition proceedings
Jun 23, 2025
Decision of the Opposition Division and instruction
Jun 23, 2025
Grounds for the decision (Annex) - opposition
Jun 23, 2025
Interlocutory decision in opposition proceedings
Jun 23, 2025
Interlocutory decision in opposition proceedings
Jun 23, 2025
Means of redress
May 15, 2025
Brief communication - Opposition proceedings
May 14, 2025
(Electronic) Receipt
May 14, 2025
Amended description with annotations
May 14, 2025
Description
May 14, 2025
Letter accompanying subsequently filed items
May 14, 2025
Reply to an examination report in opposition proceedings
Mar 19, 2025
Annex to the communication - opposition
Mar 19, 2025
Brief communication - Opposition proceedings
Mar 19, 2025
Brief communication - Opposition proceedings
Mar 19, 2025
Communication inviting the parties to file observations
Mar 19, 2025
Communication inviting the parties to file observations
Dec 19, 2024
Brief communication - Opposition proceedings
Dec 16, 2024
(Electronic) Receipt
Dec 16, 2024
Letter accompanying subsequently filed items
Dec 16, 2024
Reply to an examination report in opposition proceedings
Nov 18, 2024
Annex to the communication - opposition
Nov 18, 2024
Brief communication - Opposition proceedings
Nov 18, 2024
Brief communication - Opposition proceedings
Nov 18, 2024
Communication inviting the parties to file observations
Nov 18, 2024
Communication inviting the parties to file observations
Sep 25, 2024
Brief communication - Opposition proceedings
Sep 20, 2024
(Electronic) Receipt
Sep 20, 2024
Amended description with annotations
Sep 20, 2024
Description
Sep 20, 2024
Letter accompanying subsequently filed items
Sep 20, 2024
Reply to an examination report in opposition proceedings
Jul 23, 2024
Annex to the communication - opposition
Jul 23, 2024
Brief communication - Opposition proceedings
Jul 23, 2024
Brief communication - Opposition proceedings
Jul 23, 2024
Communication inviting the parties to file observations
Jul 23, 2024
Communication inviting the parties to file observations
Jul 15, 2024
Decision of the Board of Appeal
Jul 15, 2024
F3032 Notification(s) of the decision
May 3, 2024
F3013 Oral Proceedings: Forwarding minutes
May 3, 2024
F3317 Oral Proceedings: Minutes (Appellant: Proprietor + Opponent)
Apr 18, 2024
F3345 Forwarding of submissions to parties
Apr 17, 2024
(Electronic) Receipt
Apr 17, 2024
Annexes (other than cited documents) regarding appeal procedure
Apr 17, 2024
Letter accompanying subsequently filed items
Apr 17, 2024
Letter dealing with oral proceedings during the appeal procedure
Mar 27, 2024
F3345 Forwarding of submissions to parties
Mar 25, 2024
(Electronic) Receipt
Mar 25, 2024
Letter accompanying subsequently filed items
Mar 25, 2024
Letter dealing with oral proceedings during the appeal procedure
Mar 11, 2024
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Dec 5, 2023
Communication of amended entries concerning the representative
Dec 5, 2023
F3345 Forwarding of submissions to parties
Nov 24, 2023
Annexes in respect of a client data request
Nov 24, 2023
Letter accompanying subsequently filed items
Nov 24, 2023
Submission concerning change of proprietor's representative
Aug 28, 2023
F3345 Forwarding of submissions to parties
Aug 22, 2023
(Electronic) Receipt
Aug 22, 2023
Letter accompanying subsequently filed items
Aug 22, 2023
Letter dealing with oral proceedings during the appeal procedure
Aug 1, 2023
Advice of delivery
Jul 31, 2023
F3011.1 Oral Proceedings: summons
Jul 31, 2023
F3350 Communication regarding oral proceedings (art. 15 Rules of Procedure of the Boards of Appeal)
Jul 26, 2023
F3010 Oral proceedings: order for summons
Jun 28, 2023
F3303.16 Change of composition of the Board (T)
Apr 20, 2023
Composition of the board (T)
Mar 3, 2023
F3345 Forwarding of submissions to parties
Mar 1, 2023
(Electronic) Receipt
Mar 1, 2023
Letter accompanying subsequently filed items
Mar 1, 2023
Letter relating to Appeal Procedure
Jan 13, 2023
(Electronic) Receipt
Jan 13, 2023
Letter accompanying subsequently filed items
Jan 13, 2023
Letter relating to Appeal Procedure
Jan 11, 2023
F3345 Forwarding of submissions to parties
Jan 11, 2023
F3345 Forwarding of submissions to parties
Jan 3, 2023
(Electronic) Receipt
Jan 3, 2023
Letter accompanying subsequently filed items
Jan 3, 2023
Reply to appeal
Dec 28, 2022
(Electronic) Receipt
Dec 28, 2022
Letter accompanying subsequently filed items
Dec 28, 2022
Reply to appeal
Nov 30, 2022
Document concerning representation
Aug 29, 2022
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
Aug 26, 2022
(Electronic) Receipt
Aug 26, 2022
Amended claims with annotations
Aug 26, 2022
Amended claims with annotations
Aug 26, 2022
Amended claims with annotations
Aug 26, 2022
Amended claims with annotations
Aug 26, 2022
Amended claims with annotations
Aug 26, 2022
Auxiliary request during appeals procedure - 01
Aug 26, 2022
Auxiliary request during appeals procedure - 02
Aug 26, 2022
Auxiliary request during appeals procedure - 03
Aug 26, 2022
Auxiliary request during appeals procedure - 04
Aug 26, 2022
Auxiliary request during appeals procedure - 05
Aug 26, 2022
Letter accompanying subsequently filed items
Aug 26, 2022
Statement of grounds of appeal
Aug 24, 2022
(Electronic) Receipt
Aug 24, 2022
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
Aug 24, 2022
Letter accompanying subsequently filed items
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Non-Patent Literature cited during the appeal procedure
Aug 24, 2022
Statement of grounds of appeal
Jul 25, 2022
Communication confirming withdrawal from representation
Jul 25, 2022
Communication of amended entries concerning the representative
Jul 25, 2022
F3345 Forwarding of submissions to parties
Jul 19, 2022
(Electronic) Receipt
Jul 19, 2022
Letter accompanying subsequently filed items
Jul 19, 2022
Submission concerning change of applicant's representative
Jun 22, 2022
F3204 Communication of the file number to the parties
Jun 22, 2022
F3204 Communication of the file number to the parties
Jun 21, 2022
F3204 Communication of the file number to the parties
Jun 21, 2022
F3204 Communication of the file number to the parties
Jun 15, 2022
(Electronic) Receipt
Jun 15, 2022
Letter accompanying subsequently filed items
Jun 15, 2022
Notice of appeal
Jun 13, 2022
(Electronic) Receipt
Jun 13, 2022
Letter accompanying subsequently filed items
Jun 13, 2022
Notice of appeal
Apr 26, 2022
Advice of delivery
Apr 20, 2022
Advice of delivery
Apr 19, 2022
Annex to the communication - opposition
Apr 19, 2022
Decision of the Opposition Division and instruction
Apr 19, 2022
Grounds for the decision (Annex) - opposition
Apr 19, 2022
Interlocutory decision in opposition proceedings
Apr 19, 2022
Interlocutory decision in opposition proceedings
Apr 19, 2022
Means of redress
Apr 19, 2022
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Apr 19, 2022
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Apr 19, 2022
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Apr 19, 2022
OPPODREX with handwritten amendments
Apr 19, 2022
Provision of a copy of the minutes - opposition procedure
Apr 19, 2022
Provision of a copy of the minutes - opposition procedure
Apr 19, 2022
Scanned annex to a communication - opposition procedure
Apr 19, 2022
Scanned annex to a communication - opposition procedure
Apr 19, 2022
Transmittal of decision / summons - opposition
Apr 19, 2022
Transmittal of decision / summons - opposition
Mar 10, 2022
Information about the result of oral proceedings
Mar 3, 2022
Brief communication - Opposition proceedings
Feb 28, 2022
(Electronic) Receipt
Feb 28, 2022
Citation in opposition procedure - 036
Feb 28, 2022
Consolidated list of cited opposition documents
Feb 28, 2022
Letter accompanying subsequently filed items
Feb 28, 2022
Written submission in preparation to/during oral proceedings
Jan 14, 2022
Brief communication - Opposition proceedings
Jan 14, 2022
Brief communication - Opposition proceedings
Jan 10, 2022
(Electronic) Receipt
Jan 10, 2022
(Electronic) Receipt
Jan 10, 2022
(Electronic) Receipt
Jan 10, 2022
Authorisation
Jan 10, 2022
Auxiliary request during Opposition procedure
Jan 10, 2022
Auxiliary request during Opposition procedure
Jan 10, 2022
Auxiliary request during Opposition procedure
Jan 10, 2022
Auxiliary request during Opposition procedure
Jan 10, 2022
Auxiliary request during Opposition procedure - 01
Jan 10, 2022
Auxiliary request during Opposition procedure - 02
Jan 10, 2022
Auxiliary request during Opposition procedure - 03
Jan 10, 2022
Auxiliary request during Opposition procedure - 04
Jan 10, 2022
Citation in opposition procedure - 032
Jan 10, 2022
Citation in opposition procedure - 033
Jan 10, 2022
Citation in opposition procedure - 034
Jan 10, 2022
Citation in opposition procedure - 035
Jan 10, 2022
Letter accompanying subsequently filed items
Jan 10, 2022
Letter accompanying subsequently filed items
Jan 10, 2022
Letter accompanying subsequently filed items
Jan 10, 2022
Written submission in preparation to/during oral proceedings
Jan 10, 2022
Written submission in preparation to/during oral proceedings
Dec 29, 2021
(Electronic) Receipt
Dec 29, 2021
Letter accompanying subsequently filed items
Dec 8, 2021
Notification concerning the date of oral proceedings
Dec 8, 2021
Notification concerning the date of oral proceedings
Jun 7, 2021
Annexes in respect of a client data request
Jun 7, 2021
Annexes in respect of a client data request
May 19, 2021
Advice of delivery
May 18, 2021
Advice of delivery
May 14, 2021
Information concerning oral proceedings
May 14, 2021
Notification concerning the date of oral proceedings
May 14, 2021
Notification concerning the date of oral proceedings
May 14, 2021
Summons to attend oral proceedings
May 14, 2021
Summons to attend oral proceedings
May 14, 2021
Transmittal of decision / summons - opposition
May 14, 2021
Transmittal of decision / summons - opposition
May 11, 2021
Brief communication - Opposition proceedings
May 6, 2021
Advice of delivery
May 5, 2021
(Electronic) Receipt
May 5, 2021
Any annexes (other than citation) to an opposition letter
May 5, 2021
Letter accompanying subsequently filed items
May 5, 2021
Oral proceedings: Request for postponement
May 4, 2021
Information concerning oral proceedings
May 4, 2021
Notification concerning the date of oral proceedings
May 4, 2021
Notification concerning the date of oral proceedings
May 4, 2021
Summons to attend oral proceedings
May 4, 2021
Summons to attend oral proceedings
May 4, 2021
Transmittal of decision / summons - opposition
May 4, 2021
Transmittal of decision / summons - opposition
Apr 29, 2021
Brief communication - Opposition proceedings
Apr 22, 2021
(Electronic) Receipt
Apr 22, 2021
Any annexes (other than citation) to an opposition letter
Apr 22, 2021
Letter accompanying subsequently filed items
Apr 22, 2021
Oral proceedings: Request for postponement
Apr 9, 2021
Advice of delivery
Apr 9, 2021
Advice of delivery
Apr 7, 2021
Annex to the communication - opposition
Apr 7, 2021
Information concerning oral proceedings
Apr 7, 2021
Summons to attend oral proceedings
Apr 7, 2021
Summons to attend oral proceedings
Apr 7, 2021
Transmittal of decision / summons - opposition
Apr 7, 2021
Transmittal of decision / summons - opposition
Mar 31, 2021
Information about the result of oral proceedings
Feb 23, 2021
Brief communication - Opposition proceedings
Feb 18, 2021
(Electronic) Receipt
Feb 18, 2021
Letter accompanying subsequently filed items
Feb 18, 2021
Letter regarding the opposition procedure (no time limit)
Jan 20, 2021
Brief communication - Opposition proceedings
Dec 29, 2020
(Electronic) Receipt
Dec 29, 2020
Letter accompanying subsequently filed items
Dec 29, 2020
Reply from the opponent to submission of proprietor
Dec 21, 2020
Brief communication - Opposition proceedings
Dec 9, 2020
(Electronic) Receipt
Dec 9, 2020
Citation in opposition procedure - 029
Dec 9, 2020
Citation in opposition procedure - 030
Dec 9, 2020
Citation in opposition procedure - 031
Dec 9, 2020
Letter accompanying subsequently filed items
Dec 9, 2020
Reply of the patent proprietor to the notice(s) of opposition
Jul 31, 2020
Communication of a notice of opposition and request to file observations
Jul 31, 2020
Notice of further oppositions to opponent(s)
Jul 27, 2020
Communication of a notice of opposition - first information to patent proprietor
Jul 14, 2020
(Electronic) Receipt
Jul 14, 2020
Citation in opposition procedure - 001
Jul 14, 2020
Citation in opposition procedure - 002
Jul 14, 2020
Citation in opposition procedure - 003
Jul 14, 2020
Citation in opposition procedure - 004
Jul 14, 2020
Citation in opposition procedure - 005
Jul 14, 2020
Citation in opposition procedure - 006
Jul 14, 2020
Citation in opposition procedure - 007
Jul 14, 2020
Citation in opposition procedure - 008
Jul 14, 2020
Citation in opposition procedure - 009
Jul 14, 2020
Citation in opposition procedure - 010
Jul 14, 2020
Citation in opposition procedure - 011
Jul 14, 2020
Citation in opposition procedure - 012
Jul 14, 2020
Citation in opposition procedure - 013
Jul 14, 2020
Citation in opposition procedure - 014
Jul 14, 2020
Citation in opposition procedure - 014
Jul 14, 2020
Citation in opposition procedure - 015
Jul 14, 2020
Citation in opposition procedure - 016
Jul 14, 2020
Citation in opposition procedure - 017
Jul 14, 2020
Citation in opposition procedure - 018
Jul 14, 2020
Citation in opposition procedure - 019
Jul 14, 2020
Citation in opposition procedure - 020
Jul 14, 2020
Citation in opposition procedure - 021
Jul 14, 2020
Citation in opposition procedure - 022
Jul 14, 2020
Citation in opposition procedure - 023
Jul 14, 2020
Citation in opposition procedure - 024
Jul 14, 2020
Citation in opposition procedure - 025
Jul 14, 2020
Citation in opposition procedure - 026
Jul 14, 2020
Citation in opposition procedure - 026
Jul 14, 2020
Citation in opposition procedure - 027
Jul 14, 2020
Citation in opposition procedure - 028
Jul 14, 2020
International publication (Pamphlet)
Jul 14, 2020
Notice of opposition
Jul 14, 2020
Notice of opposition
Jul 14, 2020
Patent document cited during the opposition procedure
Jul 14, 2020
Patent document cited during the opposition procedure
Jul 14, 2020
Patent document cited during the opposition procedure
Oct 28, 2019
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Sep 19, 2019
Decision to grant a European patent
Sep 5, 2019
(Electronic) Receipt
Sep 5, 2019
Filing of the translations of the claims
Sep 5, 2019
French translation of claims
Sep 5, 2019
German translation of the claims
Sep 5, 2019
Letter accompanying subsequently filed items
May 27, 2019
Bibliographic data of the European patent application
May 27, 2019
Communication about intention to grant a European patent
May 27, 2019
Intention to grant (signatures)
May 27, 2019
Text intended for grant (clean copy)
May 27, 2019
Text intended for grant (sequence listing)
May 27, 2019
Text intended for grant (version for approval)
Jan 30, 2019
(Electronic) Receipt
Jan 30, 2019
Amended claims with annotations
Jan 30, 2019
Amended description with annotations
Jan 30, 2019
Claims
Jan 30, 2019
Description
Jan 30, 2019
Letter accompanying subsequently filed items
Jan 30, 2019
Reply to communication from the Examining Division
Dec 7, 2018
Grant of extension of time limit (examination procedure)
Dec 4, 2018
(Electronic) Receipt
Dec 4, 2018
Letter accompanying subsequently filed items
Dec 4, 2018
Request for extension of time limit to communication from the Examining Division
Jul 30, 2018
Annex to the communication
Jul 30, 2018
Communication from the Examining Division
Apr 25, 2018
(Electronic) Receipt
Apr 25, 2018
Amended claims with annotations
Apr 25, 2018
Annex
Apr 25, 2018
Annex
Apr 25, 2018
Claims
Apr 25, 2018
Letter accompanying subsequently filed items
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Non-patent literature cited during the examination procedure
Apr 25, 2018
Reply to communication from the Examining Division
Feb 6, 2018
Grant of extension of time limit (examination procedure)
Feb 1, 2018
(Electronic) Receipt
Feb 1, 2018
Letter accompanying subsequently filed items
Feb 1, 2018
Request for extension of time limit to communication from the Examining Division
Oct 20, 2017
Annex to the communication
Oct 20, 2017
Communication from the Examining Division
Oct 13, 2017
Examination started
May 8, 2017
(Electronic) Receipt
May 8, 2017
Amended claims filed after receipt of (European) search report
May 8, 2017
Amended claims with annotations
May 8, 2017
Amendments received before examination
May 8, 2017
Letter accompanying subsequently filed items
Jan 11, 2017
Notification on forthcoming publication of bibliographic data
Nov 23, 2016
Communication regarding comments on written opinion/amendment of application/payment of claims fee
Nov 18, 2016
Communication to designated inventor
Nov 16, 2016
Priority search results copy provided by EPO
Nov 3, 2016
(Electronic) Receipt
Nov 3, 2016
Amended claims filed after receipt of (European) search report
Nov 3, 2016
Amended claims with annotations
Nov 3, 2016
Amendments received before examination
Nov 3, 2016
Request for entry into the European phase
Oct 17, 2016
Copy of the international preliminary report on patentability
Aug 12, 2016
Information on entry into European phase
Nov 26, 2015
Copy of the international search report
Nov 26, 2015
International publication of the international search report
Oct 28, 2015
Priority document (electronically transmitted)
Oct 12, 2015
Communication in cases for which no other form is applicable
Oct 12, 2015
ISR: cited documents
Oct 12, 2015
ISR: cited documents
Oct 12, 2015
ISR: cover sheet
Oct 12, 2015
Notification of decision on protest
Oct 12, 2015
Separate sheet
Oct 9, 2015
Written opinion of the ISA, boxes No. I to VIII
Oct 9, 2015
Written opinion of the ISA, cover sheet
Oct 9, 2015
Written opinion of the ISA, supplemental box
Oct 8, 2015
Converted Sequence Listing
Oct 8, 2015
Published international application - A2
Jul 8, 2015
(Electronic) Receipt
Jul 8, 2015
Annex
Apr 2, 2015
(Electronic) Receipt
Apr 2, 2015
Abstract
Apr 2, 2015
Claims
Apr 2, 2015
Description
Apr 2, 2015
Drawings

EP3126390

CELLECTIS

Application Number: EP15713513A
Filing Date: Apr 2, 2015
Status: Patent Maintained As Amended; Dec 5, 2025
Publication Date: Jan 7, 2026
External Links: Slate, Register , Google Patents

IP Verse

Cd33 Specific Chimeric Antigen Receptors For Cancer Immunotherapy

Patent Summary

Patent Family

Patent Oppositions

Dossier Documents

EP3126390