Hot Water Production Device

Patent No. EP3730861 (titled "Hot Water Production Device") was filed by Daikin Industries on Dec 13, 2018. The application was issued on Mar 26, 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
MEXICHEM FLUOR DE CV	Dec 18, 2025	POTTER CLARKSON

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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Jan 20, 2026
Communication of a notice of opposition and request to file observations
Jan 20, 2026
Notice of further oppositions to opponent(s)
Jan 2, 2026
Communication of a notice of opposition - first information to patent proprietor
Dec 18, 2025
(Electronic) Receipt
Dec 18, 2025
Any annexes (other than citation) to an opposition letter
Dec 18, 2025
Citation in opposition procedure - 001
Dec 18, 2025
Citation in opposition procedure - 002
Dec 18, 2025
Citation in opposition procedure - 003
Dec 18, 2025
Citation in opposition procedure - 004
Dec 18, 2025
Citation in opposition procedure - 005
Dec 18, 2025
Citation in opposition procedure - 006
Dec 18, 2025
Citation in opposition procedure - 006
Dec 18, 2025
Citation in opposition procedure - 007
Dec 18, 2025
Citation in opposition procedure - 008
Dec 18, 2025
Citation in opposition procedure - 009
Dec 18, 2025
Consolidated list of cited opposition documents
Dec 18, 2025
Notice of opposition
Dec 18, 2025
Notice of opposition
Apr 8, 2025
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Feb 27, 2025
Decision to grant a European patent
Feb 18, 2025
(Electronic) Receipt
Feb 18, 2025
Filing of the translations of the claims
Feb 18, 2025
French translation of claims
Feb 18, 2025
German translation of the claims
Feb 18, 2025
Letter accompanying subsequently filed items
Nov 14, 2024
Annex to the communication about intention to grant a European patent
Nov 14, 2024
Bibliographic data of the European patent application
Nov 14, 2024
Communication about intention to grant a European patent
Nov 14, 2024
Intention to grant (signatures)
Nov 14, 2024
Text intended for grant (clean copy)
Nov 14, 2024
Text intended for grant (version for approval)
Oct 24, 2024
(Electronic) Receipt
Oct 24, 2024
Letter accompanying subsequently filed items
Oct 24, 2024
Request for correction/amendment of the text proposed for grant sent from 01.04.2012
Jul 15, 2024
Annex to the communication about intention to grant a European patent
Jul 15, 2024
Bibliographic data of the European patent application
Jul 15, 2024
Communication about intention to grant a European patent
Jul 15, 2024
Intention to grant (signatures)
Jul 15, 2024
Text intended for grant (clean copy)
Jul 15, 2024
Text intended for grant (version for approval)
Feb 19, 2024
(Electronic) Receipt
Feb 19, 2024
Amended claims with annotations
Feb 19, 2024
Amended description with annotations
Feb 19, 2024
Claims
Feb 19, 2024
Description
Feb 19, 2024
Letter accompanying subsequently filed items
Feb 19, 2024
Reply to communication from the Examining Division
Oct 10, 2023
Annex to the communication
Oct 10, 2023
Communication from the Examining Division
Apr 17, 2023
(Electronic) Receipt
Apr 17, 2023
Amended claims with annotations
Apr 17, 2023
Claims
Apr 17, 2023
Letter accompanying subsequently filed items
Apr 17, 2023
Reply to communication from the Examining Division
Dec 19, 2022
Communication of the registration of a transfer or change of name and/or address
Dec 8, 2022
Annex to the communication
Dec 8, 2022
Communication from the Examining Division
Dec 7, 2022
Annexes in respect of a client data request
Dec 7, 2022
Letter accompanying subsequently filed items
Dec 7, 2022
Submission concerning change of applicant's address
Dec 7, 2022
Submission concerning change of applicant's address
Dec 5, 2022
Examination started
Jun 29, 2022
Decision to allow further processing
Jun 20, 2022
(Electronic) Receipt
Jun 20, 2022
Amended claims filed after receipt of (European) search report
Jun 20, 2022
Amended claims with annotations
Jun 20, 2022
Amended description filed after receipt of (European) search report
Jun 20, 2022
Amended description with annotations
Jun 20, 2022
Letter accompanying subsequently filed items
Jun 20, 2022
Request for further processing
Apr 14, 2022
Application deemed to be withdrawn (no declaration of maintenance of the application/non-reply to the Written Opinion)
Mar 22, 2022
(Electronic) Receipt
Mar 22, 2022
Letter accompanying subsequently filed items
Mar 22, 2022
Maintenance of the application
Sep 14, 2021
Invitation to declare maintenance of the application and to correct deficiencies in the Written Opinion/amend application
Aug 27, 2021
Communication regarding the transmission of the European search report
Aug 27, 2021
European search opinion
Aug 27, 2021
Information on Search Strategy
Aug 27, 2021
Supplementary European search report
Aug 17, 2021
Search started
Dec 14, 2020
(Electronic) Receipt
Dec 14, 2020
Amended claims filed after receipt of (European) search report
Dec 14, 2020
Amended claims with annotations
Dec 14, 2020
Amended description filed after receipt of (European) search report
Dec 14, 2020
Amended description with annotations
Dec 14, 2020
Amended drawings filed after receipt of (European) search report
Dec 14, 2020
Amended drawings with annotations
Dec 14, 2020
Amendments received before examination
Dec 14, 2020
Letter accompanying subsequently filed items
Sep 30, 2020
Notification of forthcoming publication
Jul 28, 2020
Communication regarding possible amendment of the application/payment of claims fee
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 24, 2020
Communication to designated inventor
Jul 10, 2020
(Electronic) Receipt
Jul 10, 2020
Abstract
Jul 10, 2020
Claims
Jul 10, 2020
Description
Jul 10, 2020
Drawings
Jul 10, 2020
Request for entry into the European phase
Jul 6, 2020
Copy of the international preliminary report on patentability
Jul 6, 2020
Translation of the international preliminary report on patentability
May 4, 2020
Information on entry into European phase
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jul 19, 2019
Priority document (electronically transmitted)
Jun 27, 2019
Copy of the international search report
Jun 27, 2019
Copy of the translated international search report
Jun 27, 2019
International publication pamphlet

EP3730861

DAIKIN INDUSTRIES

Application Number: EP18890331A
Filing Date: Dec 13, 2018
Status: Granted And Under Opposition; Feb 21, 2025
Publication Date: Mar 26, 2025
External Links: Slate, Register , Google Patents

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Hot Water Production Device

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Dossier Documents

EP3730861