Process And Apparatus For Calcination Of Gypsum

Patent No. EP3541765 (titled "Process And Apparatus For Calcination Of Gypsum") was filed by Knauf Insulation on Nov 18, 2016. The application was issued on Aug 18, 2021.

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
SAINT GOBAIN	May 17, 2022	MURGITROYD

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 7, 2025
F3344 Setting time limit for reply/ file observations to appeal (inter partes)
Nov 4, 2025
(Electronic) Receipt
Nov 4, 2025
Letter accompanying subsequently filed items
Nov 4, 2025
Statement of grounds of appeal
Sep 4, 2025
F3204 Communication of the file number to the parties
Sep 4, 2025
F3204 Communication of the file number to the parties
Sep 1, 2025
(Electronic) Receipt
Sep 1, 2025
Notice of appeal
Sep 1, 2025
Notice of appeal
Jul 8, 2025
Annex to the communication - opposition
Jul 8, 2025
Brief communication - Opposition proceedings
Jul 8, 2025
Brief communication - Opposition proceedings
Jul 8, 2025
Decision of the Opposition Division and instruction
Jul 8, 2025
Decision rejecting the opposition
Jul 8, 2025
Decision rejecting the opposition
Jul 8, 2025
Grounds for the decision (Annex) - opposition
Jul 8, 2025
Means of redress
Jul 8, 2025
Minutes of the oral proceedings (Opposition Division) - conclusion of the proceedings
Jul 8, 2025
Minutes of the oral proceedings (Opposition Division) - introduction of the parties
Jul 8, 2025
Provision of a copy of the minutes - opposition procedure
Jul 8, 2025
Provision of a copy of the minutes - opposition procedure
Jul 8, 2025
Scanned annex to a communication - opposition procedure
May 8, 2025
Information about the result of oral proceedings
May 2, 2025
Brief communication - Opposition proceedings
Apr 25, 2025
(Electronic) Receipt
Apr 25, 2025
Auxiliary request during Opposition procedure
Apr 25, 2025
Auxiliary request during Opposition procedure
Apr 25, 2025
Auxiliary request during Opposition procedure
Apr 25, 2025
Auxiliary request during Opposition procedure
Apr 25, 2025
Auxiliary request during Opposition procedure
Apr 25, 2025
Auxiliary request during Opposition procedure - 01
Apr 25, 2025
Auxiliary request during Opposition procedure - 02
Apr 25, 2025
Auxiliary request during Opposition procedure - 03
Apr 25, 2025
Auxiliary request during Opposition procedure - 04
Apr 25, 2025
Auxiliary request during Opposition procedure - 05
Apr 25, 2025
Letter accompanying subsequently filed items
Apr 25, 2025
Written submission in preparation to/during oral proceedings
Mar 13, 2025
Brief communication - Opposition proceedings
Mar 11, 2025
Brief communication - Opposition proceedings
Mar 7, 2025
(Electronic) Receipt
Mar 7, 2025
Letter accompanying subsequently filed items
Mar 7, 2025
Written submission in preparation to/during oral proceedings
Mar 6, 2025
(Electronic) Receipt
Mar 6, 2025
Request for interpreters during oral proceedings
Jul 15, 2024
Annex to the communication - opposition
Jul 15, 2024
Information concerning oral proceedings
Jul 15, 2024
Scanned annex to a communication - opposition procedure
Jul 15, 2024
Summons to attend oral proceedings
Jul 15, 2024
Summons to attend oral proceedings
Oct 12, 2022
Brief communication - Opposition proceedings
Oct 6, 2022
(Electronic) Receipt
Oct 6, 2022
Auxiliary request during Opposition procedure
Oct 6, 2022
Auxiliary request during Opposition procedure
Oct 6, 2022
Auxiliary request during Opposition procedure - 01
Oct 6, 2022
Auxiliary request during Opposition procedure - 02
Oct 6, 2022
Citation in opposition procedure - 010
Oct 6, 2022
Citation in opposition procedure - 011
Oct 6, 2022
Consolidated list of cited opposition documents
Oct 6, 2022
Letter accompanying subsequently filed items
Oct 6, 2022
Reply of the patent proprietor to the notice(s) of opposition
Jun 2, 2022
Communication of a notice of opposition and request to file observations
Jun 2, 2022
Notice of further oppositions to opponent(s)
May 23, 2022
Communication of a notice of opposition - first information to patent proprietor
May 17, 2022
(Electronic) Receipt
May 17, 2022
Citation in opposition procedure - 001
May 17, 2022
Citation in opposition procedure - 001
May 17, 2022
Citation in opposition procedure - 002
May 17, 2022
Citation in opposition procedure - 003
May 17, 2022
Citation in opposition procedure - 004
May 17, 2022
Citation in opposition procedure - 005
May 17, 2022
Citation in opposition procedure - 005
May 17, 2022
Citation in opposition procedure - 006
May 17, 2022
Citation in opposition procedure - 007
May 17, 2022
Citation in opposition procedure - 008
May 17, 2022
Citation in opposition procedure - 009
May 17, 2022
Notice of opposition
May 17, 2022
Notice of opposition
Aug 31, 2021
Transmission of the certificate for a European patent pursuant to Rule 74 EPC
Jul 22, 2021
Decision to grant a European patent
Jul 9, 2021
(Electronic) Receipt
Jul 9, 2021
French translation of claims
Jul 9, 2021
German translation of the claims
Jul 9, 2021
Letter accompanying subsequently filed items
Mar 10, 2021
Bibliographic data of the European patent application
Mar 10, 2021
Communication about intention to grant a European patent
Mar 10, 2021
Intention to grant (signatures)
Mar 10, 2021
Text intended for grant (clean copy)
Mar 10, 2021
Text intended for grant (version for approval)
Dec 18, 2020
(Electronic) Receipt
Dec 18, 2020
Amended description with annotations
Dec 18, 2020
Description
Dec 18, 2020
Letter accompanying subsequently filed items
Dec 18, 2020
Reply to communication from the Examining Division
Oct 30, 2020
Annex to the communication
Oct 30, 2020
Communication from the Examining Division
Oct 13, 2020
(Electronic) Receipt
Oct 13, 2020
Letter accompanying subsequently filed items
Oct 13, 2020
Reply to communication from the Examining Division
Aug 20, 2020
Grant of extension of time limit (examination procedure)
Aug 17, 2020
(Electronic) Receipt
Aug 17, 2020
Request for extension of time limit to communication from the Examining Division
Apr 6, 2020
Annex to the communication
Apr 6, 2020
Communication from the Examining Division
Feb 28, 2020
Examination started
Dec 18, 2019
(Electronic) Receipt
Dec 18, 2019
Amended claims filed after receipt of (European) search report
Dec 18, 2019
Amended claims with annotations
Dec 18, 2019
Amendments received before examination
Dec 18, 2019
Letter accompanying subsequently filed items
Aug 28, 2019
Notification on forthcoming publication of bibliographic data
Jul 3, 2019
Communication concerning correction of deficiencies in written opinion/amendment of application/payment of claims fee
Jun 28, 2019
Acknowledgement of receipt of observations by third party
Jun 28, 2019
Communication to applicant regarding observations by third parties
Jun 24, 2019
Communication to designated inventor
Jun 24, 2019
Communication to designated inventor
Jun 24, 2019
Communication to designated inventor
Jun 21, 2019
Citation filed by a third party
Jun 21, 2019
Citation filed by a third party
Jun 21, 2019
Observations by third parties
Jun 21, 2019
Observations by third parties
Jun 18, 2019
(Electronic) Receipt
Jun 18, 2019
Letter concerning fees and payments
Jun 14, 2019
Copy of the international preliminary report on patentability
Mar 22, 2019
(Electronic) Receipt
Mar 22, 2019
Letter accompanying subsequently filed items
Mar 22, 2019
Matter concerning the application
Mar 18, 2019
Note on telephone consultation
Mar 6, 2019
(Electronic) Receipt
Mar 6, 2019
Letter accompanying subsequently filed items
Mar 1, 2019
Information regarding early processing
Feb 21, 2019
(Electronic) Receipt
Feb 21, 2019
Request for entry into the European phase
May 24, 2018
Copy of the international preliminary report on patentability
May 24, 2018
Copy of the international search report
May 24, 2018
Published international application - A1
Aug 11, 2017
Written opinion of the ISA, boxes No. I to VIII
Aug 11, 2017
Written opinion of the ISA, cover sheet
Aug 11, 2017
Written opinion of the ISA, supplemental box
Dec 1, 2016
Notification of the international application number and of the international filing date
Nov 21, 2016
Document concerning fees and payments
Nov 18, 2016
Abstract
Nov 18, 2016
Claims
Nov 18, 2016
Confirmation copy of request for grant of an international application
Nov 18, 2016
Description
Nov 18, 2016
Document concerning fees and payments
Nov 18, 2016
Drawings
Nov 18, 2016
FAX Request for grant of an international application
Nov 18, 2016
Incoming letter related to PCT RO

EP3541765

KNAUF INSULATION

Application Number: EP16808913A
Filing Date: Nov 18, 2016
Status: Granted And Under Opposition; Jul 16, 2021
Publication Date: Aug 18, 2021
External Links: Slate, Register , Google Patents

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Process And Apparatus For Calcination Of Gypsum

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Dossier Documents

EP3541765