The weekly litigation news digest is live. Subscribe now
The patent EP3947528 was granted to IGK Isolierglasklebstoffe on Jun 7, 2023. The application was filed on Mar 31, 2020 under application number EP20717590A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

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 | Opposition Status |
|---|---|---|---|
| FENZI | Mar 6, 2024 | HOFFMANN EITLE | ADMISSIBLE |
| KOMMERLING CHEMISCHE FABRIK | Mar 6, 2024 | PATENTANWALTSKANZLEI VIEL & WIESKE PARTGMBB | WITHDRAWN |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | DE10204174 |
| DESCRIPTION | DE19632063 |
| DESCRIPTION | DE69503462T |
| DESCRIPTION | EP0287025 |
| DESCRIPTION | EP0312967 |
| DESCRIPTION | EP0434840 |
| DESCRIPTION | EP0452875 |
| DESCRIPTION | EP0537660 |
| DESCRIPTION | EP0916801 |
| DESCRIPTION | EP1245601 |
| DESCRIPTION | EP2190919 |
| DESCRIPTION | EP2277931 |
| DESCRIPTION | EP2516576 |
| DESCRIPTION | WO2009060199 |
| DESCRIPTION | WO2010094725 |
| DESCRIPTION | WO2011078922 |
| DESCRIPTION | WO2012015997 |
| DESCRIPTION | WO2017162839 |
| DESCRIPTION | WO2018054791 |
| DESCRIPTION | WO2018116949 |
| INTERNATIONAL-SEARCH-REPORT | EP0889108 |
| INTERNATIONAL-SEARCH-REPORT | EP2420536 |
| INTERNATIONAL-SEARCH-REPORT | WO2004081329 |
| INTERNATIONAL-SEARCH-REPORT | WO2011056379 |
| OPPOSITION | DE102006003935 |
| OPPOSITION | DE102007045104 |
| OPPOSITION | DE10338069 |
| OPPOSITION | DE19821355 |
| OPPOSITION | EP0024501 |
| OPPOSITION | EP1893545 |
| OPPOSITION | US2012199199 |
| OPPOSITION | US2012304591 |
| OPPOSITION | US8865817 |
| OPPOSITION | US9873820 |
| OPPOSITION | WO0172922 |
| OPPOSITION | WO2004081329 |
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
Get instant alerts for new documents
Oct 30, 2025
Oct 30, 2025
Oct 30, 2025
Oct 30, 2025
Oct 30, 2025
Oct 30, 2025
Oct 23, 2025
Oct 23, 2025
Oct 22, 2025
Oct 16, 2025
Oct 16, 2025
Oct 16, 2025
Oct 13, 2025
Oct 10, 2025
Oct 8, 2025
Oct 8, 2025
Oct 8, 2025
Oct 7, 2025
Oct 7, 2025
Oct 7, 2025
Oct 7, 2025
Oct 7, 2025
Oct 7, 2025
Oct 7, 2025
Jul 4, 2025
Jul 4, 2025
Jul 4, 2025
Jul 4, 2025
Jul 4, 2025
May 16, 2025
May 16, 2025
May 14, 2025
May 9, 2025
May 9, 2025
May 9, 2025
May 9, 2025
May 7, 2025
May 7, 2025
May 7, 2025
May 6, 2025
May 6, 2025
May 6, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Apr 30, 2025
Dec 18, 2024
Dec 18, 2024
Dec 18, 2024
Dec 13, 2024
Dec 13, 2024
Dec 13, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Nov 14, 2024
Aug 16, 2024
Aug 16, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Aug 12, 2024
Apr 11, 2024
Apr 11, 2024
Apr 11, 2024
Mar 20, 2024
Mar 20, 2024
Mar 20, 2024
Mar 15, 2024
Mar 13, 2024
Mar 13, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Mar 6, 2024
Jun 20, 2023
May 11, 2023
Decision to grant a European patent
Search/Exam
Mar 22, 2023
Mar 16, 2023
(Electronic) Receipt
Search/Exam
Mar 16, 2023
English translation of the claims
Search/Exam
Mar 16, 2023
Filing of the translations of the claims
Search/Exam
Mar 16, 2023
French translation of claims
Search/Exam
Mar 16, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 1, 2023
(Electronic) Receipt
Search/Exam
Mar 1, 2023
Letter accompanying subsequently filed items
Search/Exam
Mar 1, 2023
Nov 9, 2022
Nov 9, 2022
Nov 9, 2022
Nov 9, 2022
Intention to grant (signatures)
Search/Exam
Nov 9, 2022
Text intended for grant (clean copy)
Search/Exam
Nov 9, 2022
Oct 10, 2022
Examination started
Search/Exam
Jul 12, 2022
(Electronic) Receipt
Search/Exam
Jul 12, 2022
Letter accompanying subsequently filed items
Search/Exam
Jul 12, 2022
Priority search results
Search/Exam
Jul 12, 2022
Jun 28, 2022
May 20, 2022
(Electronic) Receipt
Search/Exam
May 20, 2022
May 20, 2022
Amended claims with annotations
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Amendments received before examination
Search/Exam
May 20, 2022
Letter accompanying subsequently filed items
Search/Exam
May 4, 2022
May 4, 2022
Jan 12, 2022
Nov 10, 2021
Oct 18, 2021
Oct 5, 2021
(Electronic) Receipt
Search/Exam
Oct 5, 2021
Request for entry into the European phase
Search/Exam
Aug 13, 2021
Information on entry into European phase
Search/Exam
Oct 26, 2020
Oct 8, 2020
Copy of the international search report
Search/Exam
Oct 8, 2020
Copy of the international search report
Search/Exam
Oct 8, 2020
Published international application - A1
Search/Exam
May 7, 2020
May 4, 2020
(Electronic) Receipt
PCTRO
May 4, 2020
May 4, 2020
May 4, 2020
Apr 22, 2020
Apr 22, 2020
Mar 31, 2020
(Electronic) Receipt
PCTRO
Mar 31, 2020
Abstract
PCTRO
Mar 31, 2020
Claims
PCTRO
Mar 31, 2020
Description
PCTRO
Mar 31, 2020
Mar 31, 2020