Method For Producing Methyl Tertiary-Butyl Ether

Patent No. EP3395792 (titled "Method For Producing Methyl Tertiary-Butyl Ether") was filed by LG Chem on Jan 4, 2018. The application was issued on Oct 22, 2025.

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
EVONIK OPERATIONS	Jun 4, 2020	EVONIK PATENT ASSOCIATION

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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Sep 25, 2025
Decision to maintain the European patent in amended form
Sep 25, 2025
Decision to maintain the European patent in amended form
Sep 18, 2025
(Electronic) Receipt
Sep 18, 2025
French translation of claims
Sep 18, 2025
German translation of the claims
Sep 18, 2025
Letter accompanying subsequently filed items
Jul 7, 2025
Communication of bibliographic data
Jul 7, 2025
Communication to opponent concerning maintenance
Jul 7, 2025
Communication with request to file translations
Jul 2, 2025
Maintenance of the patent with the documents specified in the final decision
Jun 13, 2025
Decision of the Board of Appeal
Jun 13, 2025
F3032 Notification(s) of the decision
Jun 13, 2025
F3032 Notification(s) of the decision
Mar 17, 2025
F3013 Oral Proceedings: Forwarding minutes
Mar 17, 2025
F3013 Oral Proceedings: Forwarding minutes
Mar 17, 2025
F3316 Oral Proceedings: Minutes (Appellant: Opponent)
Feb 17, 2025
F3345 Forwarding of submissions to parties
Feb 12, 2025
(Electronic) Receipt
Feb 12, 2025
Letter accompanying subsequently filed items
Feb 12, 2025
Letter dealing with oral proceedings during the appeal procedure
Feb 11, 2025
(Electronic) Receipt
Feb 11, 2025
F3345 Forwarding of submissions to parties
Feb 11, 2025
Letter accompanying subsequently filed items
Feb 11, 2025
Letter dealing with oral proceedings during the appeal procedure
Dec 13, 2024
(Electronic) Receipt
Dec 13, 2024
(Electronic) Receipt
Dec 13, 2024
Advice of delivery
Dec 13, 2024
Advice of delivery
Dec 13, 2024
Letter accompanying subsequently filed items
Dec 13, 2024
Letter accompanying subsequently filed items
Dec 4, 2024
Communication about missing proof of delivery
Nov 28, 2024
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Nov 28, 2024
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Nov 4, 2024
F3345 Forwarding of submissions to parties
Nov 4, 2024
Oral proceedings: change of venue
Nov 4, 2024
Oral proceedings: change of venue
Oct 29, 2024
(Electronic) Receipt
Oct 29, 2024
Letter accompanying subsequently filed items
Oct 29, 2024
Letter dealing with oral proceedings during the appeal procedure
Oct 16, 2024
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Oct 16, 2024
F3305 Communication of the Board of Appeal (ex parte/ inter partes)
Oct 11, 2024
F3345 Forwarding of submissions to parties
Oct 8, 2024
(Electronic) Receipt
Oct 8, 2024
Letter dealing with oral proceedings during the appeal procedure
Oct 8, 2024
Written submission in preparation to/during oral proceedings
Oct 1, 2024
F3011.1 Oral Proceedings: summons
Oct 1, 2024
F3011.1 Oral Proceedings: summons
Sep 26, 2024
F3010 Oral proceedings: order for summons
Jan 4, 2024
Composition of the board (T)
Jan 13, 2023
F3345 Forwarding of submissions to parties
Jan 10, 2023
(Electronic) Receipt
Jan 10, 2023
Letter accompanying subsequently filed items
Jan 10, 2023
Letter relating to Appeal Procedure
Nov 7, 2022
F3345 Forwarding of submissions to parties
Nov 2, 2022
(Electronic) Receipt
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Amended claims with annotations
Nov 2, 2022
Auxiliary request during appeals procedure - 01
Nov 2, 2022
Auxiliary request during appeals procedure - 02
Nov 2, 2022
Auxiliary request during appeals procedure - 03
Nov 2, 2022
Auxiliary request during appeals procedure - 04
Nov 2, 2022
Auxiliary request during appeals procedure - 05
Nov 2, 2022
Auxiliary request during appeals procedure - 06
Nov 2, 2022
Auxiliary request during appeals procedure - 07
Nov 2, 2022
Auxiliary request during appeals procedure - 08
Nov 2, 2022
Auxiliary request during appeals procedure - 09
Nov 2, 2022
Claims
Nov 2, 2022
Letter accompanying subsequently filed items
Nov 2, 2022
Reply to appeal
Jun 21, 2022
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
Jun 15, 2022
(Electronic) Receipt
Jun 15, 2022
Citation in appeal procedure - 008
Jun 15, 2022
Citation in appeal procedure - 009
Jun 15, 2022
Letter accompanying subsequently filed items
Jun 15, 2022
Statement of grounds of appeal
Apr 22, 2022
F3204 Communication of the file number to the parties
Apr 22, 2022
F3204 Communication of the file number to the parties
Apr 13, 2022
(Electronic) Receipt
Apr 13, 2022
Letter accompanying subsequently filed items
Apr 13, 2022
Notice of appeal
Feb 23, 2022
Advice of delivery
Feb 16, 2022
Advice of delivery
Feb 16, 2022
Decision of the Opposition Division and instruction
Feb 16, 2022
Grounds for the decision (Annex) - opposition
Feb 16, 2022
Interlocutory decision in opposition proceedings
Feb 16, 2022
Interlocutory decision in opposition proceedings
Feb 16, 2022
Means of redress
Feb 16, 2022
Transmittal of decision / summons - opposition
Feb 16, 2022
Transmittal of decision / summons - opposition
Feb 14, 2022
Annex to the communication - opposition
Feb 14, 2022
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Feb 14, 2022
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Feb 14, 2022
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Feb 14, 2022
Provision of a copy of the minutes - opposition procedure
Feb 14, 2022
Provision of a copy of the minutes - opposition procedure
Feb 9, 2022
Acknowledgement of a document
Feb 9, 2022
Acknowledgement of a document
Oct 6, 2021
Information about the result of oral proceedings
Sep 22, 2021
(Electronic) Receipt
Sep 22, 2021
Letter accompanying subsequently filed items
Sep 6, 2021
Brief communication - Opposition proceedings
Aug 27, 2021
(Electronic) Receipt
Aug 27, 2021
Letter accompanying subsequently filed items
Aug 27, 2021
Written submission in preparation to/during oral proceedings
Aug 16, 2021
Brief communication - Opposition proceedings
Aug 9, 2021
Brief communication - Opposition proceedings
Aug 6, 2021
(Electronic) Receipt
Aug 6, 2021
(Electronic) Receipt
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure
Aug 6, 2021
Auxiliary request during Opposition procedure - 01
Aug 6, 2021
Auxiliary request during Opposition procedure - 02
Aug 6, 2021
Auxiliary request during Opposition procedure - 03
Aug 6, 2021
Auxiliary request during Opposition procedure - 04
Aug 6, 2021
Auxiliary request during Opposition procedure - 05
Aug 6, 2021
Auxiliary request during Opposition procedure - 06
Aug 6, 2021
Auxiliary request during Opposition procedure - 07
Aug 6, 2021
Auxiliary request during Opposition procedure - 08
Aug 6, 2021
Auxiliary request during Opposition procedure - 09
Aug 6, 2021
Auxiliary request during Opposition procedure - 10
Aug 6, 2021
Letter accompanying subsequently filed items
Aug 6, 2021
Main request during Opposition procedure
Aug 6, 2021
Main request during Opposition procedure
Aug 6, 2021
Written submission in preparation to/during oral proceedings
Aug 4, 2021
(Electronic) Receipt
Aug 4, 2021
Letter accompanying subsequently filed items
Aug 4, 2021
Written submission in preparation to/during oral proceedings
Jun 22, 2021
Notification concerning the date of oral proceedings
Jun 22, 2021
Notification concerning the date of oral proceedings
Nov 25, 2020
Advice of delivery
Nov 20, 2020
Advice of delivery
Nov 16, 2020
Acknowledgement of a document
Nov 16, 2020
Acknowledgement of a document
Nov 16, 2020
Annex to the communication - opposition
Nov 16, 2020
Information concerning oral proceedings
Nov 16, 2020
Summons to attend oral proceedings
Nov 16, 2020
Summons to attend oral proceedings
Oct 29, 2020
Brief communication - Opposition proceedings
Oct 23, 2020
(Electronic) Receipt
Oct 23, 2020
Auxiliary request during Opposition procedure - 01
Oct 23, 2020
Auxiliary request during Opposition procedure - 01
Oct 23, 2020
Auxiliary request during Opposition procedure - 02
Oct 23, 2020
Auxiliary request during Opposition procedure - 02
Oct 23, 2020
Letter accompanying subsequently filed items
Oct 23, 2020
Main request during Opposition procedure
Oct 23, 2020
Main request during Opposition procedure
Oct 23, 2020
Reply of the patent proprietor to the notice(s) of opposition
Jun 19, 2020
Communication of a notice of opposition and request to file observations
Jun 19, 2020
Notice of further oppositions to opponent(s)
Jun 9, 2020
Communication of a notice of opposition - first information to patent proprietor
Jun 4, 2020
(Electronic) Receipt
Jun 4, 2020
Citation in opposition procedure - 001
Jun 4, 2020
Citation in opposition procedure - 002
Jun 4, 2020
Citation in opposition procedure - 003
Jun 4, 2020
Citation in opposition procedure - 004
Jun 4, 2020
Citation in opposition procedure - 005
Jun 4, 2020
Citation in opposition procedure - 006
Jun 4, 2020
Citation in opposition procedure - 007
Jun 4, 2020
Consolidated list of cited opposition documents
Jun 4, 2020
Notice of opposition
Jun 4, 2020
Notice of opposition
Sep 16, 2019
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Aug 8, 2019
Decision to grant a European patent
Jul 23, 2019
Copy of the international preliminary report on patentability
Jul 23, 2019
Translation of the international preliminary report on patentability
Jul 22, 2019
(Electronic) Receipt
Jul 22, 2019
Filing of the translations of the claims
Jul 22, 2019
French translation of claims
Jul 22, 2019
German translation of the claims
Jun 3, 2019
Bibliographic data of the European patent application
Jun 3, 2019
Communication about intention to grant a European patent
Jun 3, 2019
Intention to grant (signatures)
Jun 3, 2019
Text intended for grant (clean copy)
Jun 3, 2019
Text intended for grant (version for approval)
May 8, 2019
Examination started
Apr 23, 2019
(Electronic) Receipt
Apr 23, 2019
Letter accompanying subsequently filed items
Apr 23, 2019
Maintenance of the application
Mar 28, 2019
Invitation to declare maintenance of the application and to correct deficiencies in the Written Opinion/amend application
Mar 11, 2019
Communication regarding the transmission of the European search report
Mar 11, 2019
European search opinion
Mar 11, 2019
Information on Search Strategy
Mar 11, 2019
Supplementary European search report
Feb 28, 2019
Search started
Jan 3, 2019
Invitation to indicate correct address of inventor
Jan 3, 2019
Invitation to indicate correct address of inventor
Dec 20, 2018
Letter which had not been notified
Dec 20, 2018
Letter which had not been notified
Nov 2, 2018
Invitation to indicate correct address of inventor
Oct 26, 2018
Letter which had not been notified
Oct 9, 2018
Translation of the international preliminary report on patentability
Oct 9, 2018
Transmission of a document (International preliminary examination report)
Oct 4, 2018
Notification of forthcoming publication
Aug 16, 2018
Notification of the recording of a change
Aug 13, 2018
Communication for party to proceedings/third party
Aug 9, 2018
Confirmation of effective date of early entry
Aug 9, 2018
Enquiry with the International Bureau
Aug 8, 2018
Communication to designated inventor
Aug 8, 2018
Communication to designated inventor
Aug 8, 2018
Communication to designated inventor
Aug 8, 2018
Communication to designated inventor
Aug 3, 2018
Priority document (electronically transmitted)
Aug 3, 2018
Priority document (electronically transmitted)
Jul 24, 2018
(Electronic) Receipt
Jul 24, 2018
Abstract
Jul 24, 2018
Claims
Jul 24, 2018
Description
Jul 24, 2018
Drawings
Jul 24, 2018
Request for entry into the European phase
Jul 12, 2018
Copy of the international search report
Jul 12, 2018
Copy of the translated international search report
Jul 12, 2018
International publication pamphlet

EP3395792

LG CHEM

Application Number: EP18736760A
Filing Date: Jan 4, 2018
Status: Patent Maintained As Amended; Sep 19, 2025
Publication Date: Oct 22, 2025
External Links: Slate, Register , Google Patents

IP Verse

Method For Producing Methyl Tertiary-Butyl Ether

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Dossier Documents

EP3395792