Micro-Channel Heat Exchanger

Patent No. EP3591324 (titled "Micro-Channel Heat Exchanger") was filed by Zhejiang Dunan Thermal Technology on Jul 3, 2019. The application was issued on Sep 6, 2023.

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
SCHMIDT MARTIN	Mar 21, 2024	ADVOTEC

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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Nov 17, 2025
Annex to the communication - opposition
Nov 17, 2025
Brief communication - Opposition proceedings
Nov 17, 2025
Brief communication - Opposition proceedings
Nov 17, 2025
Decision of the Opposition Division and instruction
Nov 17, 2025
Decision rejecting the opposition
Nov 17, 2025
Decision rejecting the opposition
Nov 17, 2025
Grounds for the decision (Annex) - opposition
Nov 17, 2025
Means of redress
Nov 17, 2025
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Nov 17, 2025
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Nov 17, 2025
Provision of a copy of the minutes - opposition procedure
Nov 17, 2025
Provision of a copy of the minutes - opposition procedure
Nov 17, 2025
Scanned annex to a communication - opposition procedure
Oct 7, 2025
Brief communication - Opposition proceedings
Oct 7, 2025
Information about the result of oral proceedings
Oct 6, 2025
(Electronic) Receipt
Oct 6, 2025
Brief communication - Opposition proceedings
Oct 6, 2025
Letter accompanying subsequently filed items
Oct 6, 2025
Request for interpreters during oral proceedings
Oct 2, 2025
(Electronic) Receipt
Oct 2, 2025
Brief communication - Opposition proceedings
Oct 2, 2025
Letter accompanying subsequently filed items
Oct 2, 2025
Request for interpreters during oral proceedings
Sep 30, 2025
(Electronic) Receipt
Sep 30, 2025
Letter accompanying subsequently filed items
Sep 30, 2025
Written submission in preparation to/during oral proceedings
Sep 10, 2025
Brief communication - Opposition proceedings
Aug 18, 2025
Brief communication - Opposition proceedings
Aug 13, 2025
Brief communication - Opposition proceedings
Aug 7, 2025
(Electronic) Receipt
Aug 7, 2025
Auxiliary request during Opposition procedure
Aug 7, 2025
Auxiliary request during Opposition procedure
Aug 7, 2025
Auxiliary request during Opposition procedure
Aug 7, 2025
Auxiliary request during Opposition procedure - 01
Aug 7, 2025
Auxiliary request during Opposition procedure - 02
Aug 7, 2025
Auxiliary request during Opposition procedure - 03
Aug 7, 2025
Letter accompanying subsequently filed items
Aug 7, 2025
Main request during Opposition procedure
Aug 7, 2025
Written submission in preparation to/during oral proceedings
Aug 6, 2025
Brief communication - Opposition proceedings
Jul 31, 2025
(Electronic) Receipt
Jul 31, 2025
Citation in opposition procedure - 002
Jul 31, 2025
Citation in opposition procedure - 003
Jul 31, 2025
Citation in opposition procedure - 005
Jul 31, 2025
Citation in opposition procedure - 005
Jul 31, 2025
Consolidated list of cited opposition documents
Jul 31, 2025
Letter accompanying subsequently filed items
Jul 31, 2025
Request for interpreters during oral proceedings
Jul 31, 2025
Written submission in preparation to/during oral proceedings
Jan 22, 2025
Annex to the communication - opposition
Jan 22, 2025
Information concerning oral proceedings
Jan 22, 2025
Scanned annex to a communication - opposition procedure
Jan 22, 2025
Summons to attend oral proceedings
Jan 22, 2025
Summons to attend oral proceedings
Oct 24, 2024
Brief communication - Opposition proceedings
Oct 18, 2024
(Electronic) Receipt
Oct 18, 2024
Letter accompanying subsequently filed items
Oct 18, 2024
Reply of the patent proprietor to the notice(s) of opposition
Jun 18, 2024
Communication of a notice of opposition and request to file observations
Jun 18, 2024
Notice of further oppositions to opponent(s)
Jun 3, 2024
Brief communication - Opposition proceedings
May 28, 2024
(Electronic) Receipt
May 28, 2024
Letter accompanying subsequently filed items
May 28, 2024
Letter regarding the opposition procedure (no time limit)
Mar 27, 2024
Communication of a notice of opposition - first information to patent proprietor
Mar 21, 2024
(Electronic) Receipt
Mar 21, 2024
Citation in opposition procedure
Mar 21, 2024
Citation in opposition procedure - 001
Mar 21, 2024
Citation in opposition procedure - 002
Mar 21, 2024
Citation in opposition procedure - 003
Mar 21, 2024
Citation in opposition procedure - 004
Mar 21, 2024
Notice of opposition
Mar 21, 2024
Notice of opposition
Sep 19, 2023
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Aug 10, 2023
Decision to grant a European patent
Jul 31, 2023
(Electronic) Receipt
Jul 31, 2023
Filing of the translations of the claims
Jul 31, 2023
French translation of claims
Jul 31, 2023
German translation of the claims
Apr 18, 2023
Annex to the communication about intention to grant a European patent
Apr 18, 2023
Bibliographic data of the European patent application
Apr 18, 2023
Communication about intention to grant a European patent
Apr 18, 2023
Intention to grant (signatures)
Apr 18, 2023
Text intended for grant (clean copy)
Apr 18, 2023
Text intended for grant (version for approval)
Jun 30, 2022
(Electronic) Receipt
Jun 30, 2022
Amended claims with annotations
Jun 30, 2022
Claims
Jun 30, 2022
Letter accompanying subsequently filed items
Jun 30, 2022
Reply to communication from the Examining Division
Mar 2, 2022
Annex to the communication
Mar 2, 2022
Communication from the Examining Division
Nov 10, 2021
Document concerning representation
Nov 10, 2021
Letter accompanying subsequently filed items
Jun 18, 2021
(Electronic) Receipt
Jun 18, 2021
Amended drawings with annotations
Jun 18, 2021
Drawings
Jun 18, 2021
Letter accompanying subsequently filed items
Jun 18, 2021
Reply to communication from the Examining Division
Feb 10, 2021
Annex to the communication
Feb 10, 2021
Communication from the Examining Division
Sep 1, 2020
(Electronic) Receipt
Sep 1, 2020
Amended claims with annotations
Sep 1, 2020
Claims
Sep 1, 2020
Letter accompanying subsequently filed items
Sep 1, 2020
Reply to communication from the Examining Division
Jun 4, 2020
Communication of amended entries concerning the representative
May 29, 2020
Submission concerning change of applicant's representative
May 20, 2020
Annex to the communication
May 20, 2020
Communication from the Examining Division
May 13, 2020
Examination started
Apr 29, 2020
(Electronic) Receipt
Apr 29, 2020
Letter accompanying subsequently filed items
Apr 29, 2020
Statement of non-availability of priority search results
Mar 27, 2020
Invitation to file a copy of search results(priority)
Mar 16, 2020
(Electronic) Receipt
Mar 16, 2020
Amended claims filed after receipt of (European) search report
Mar 16, 2020
Amended claims with annotations
Mar 16, 2020
Amended description filed after receipt of (European) search report
Mar 16, 2020
Amended description with annotations
Mar 16, 2020
Amendments received before examination
Mar 16, 2020
Letter accompanying subsequently filed items
Jan 13, 2020
Reminder period for payment of examination fee/designation fee and correction of deficiencies in Written Opinion/amendment
Dec 11, 2019
Notification of forthcoming publication
Oct 29, 2019
Communication regarding the transmission of the European search report
Oct 29, 2019
European search opinion
Oct 29, 2019
European search report
Oct 29, 2019
Information on Search Strategy
Oct 18, 2019
Invitation to indicate correct address of inventor
Oct 18, 2019
Invitation to indicate correct address of inventor
Oct 17, 2019
Search started
Oct 2, 2019
Letter which had not been notified
Oct 2, 2019
Letter which had not been notified
Sep 10, 2019
Confirmation of receipt of (electronically) transmitted priority document
Sep 3, 2019
Priority document (electronically transmitted)
Aug 26, 2019
Communication to designated inventor
Aug 26, 2019
Communication to designated inventor
Aug 26, 2019
Communication to designated inventor
Jul 3, 2019
Abstract
Jul 3, 2019
Acknowledgement of receipt of electronic submission of the request for grant of a European patent
Jul 3, 2019
Claims
Jul 3, 2019
Description
Jul 3, 2019
Designation of inventor
Jul 3, 2019
Drawings
Jul 3, 2019
Request for grant of a European patent

EP3591324

ZHEJIANG DUNAN THERMAL TECHNOLOGY

Application Number: EP19184276A
Filing Date: Jul 3, 2019
Status: Granted And Under Opposition; Aug 4, 2023
Publication Date: Sep 6, 2023
External Links: Slate, Register , Google Patents

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Micro-Channel Heat Exchanger

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Dossier Documents

EP3591324