Patent No. EP3484976 (titled "Heat Transfer Fluids And Methods For Preventing Corrosion In Heat Transfer Systems") was filed by Prestone Products on Jul 12, 2017. The application was issued on May 29, 2024.

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 |
|---|---|---|
| WEICKMANN & WEICKMANN | Feb 28, 2025 | - |
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
Sep 4, 2026
Sep 4, 2026
Sep 4, 2026
Aug 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 28, 2026
May 11, 2026
May 7, 2026
May 7, 2026
May 7, 2026
May 6, 2026
May 6, 2026
May 6, 2026
May 6, 2026
May 6, 2026
May 6, 2026
May 6, 2026
May 6, 2026
Mar 11, 2026
Mar 9, 2026
Mar 6, 2026
Mar 6, 2026
Mar 6, 2026
Mar 4, 2026
Mar 4, 2026
Mar 4, 2026
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Oct 22, 2025
Jul 28, 2025
Jul 18, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Jul 14, 2025
Mar 21, 2025
Mar 21, 2025
Mar 21, 2025
Mar 18, 2025
Mar 18, 2025
Mar 18, 2025
Mar 17, 2025
Mar 17, 2025
Mar 17, 2025
Mar 14, 2025
Mar 14, 2025
Mar 6, 2025
Feb 28, 2025
Feb 28, 2025
Feb 28, 2025
Feb 28, 2025
Feb 28, 2025
Feb 28, 2025
Feb 28, 2025
Jun 11, 2024
May 3, 2024
Apr 22, 2024
Apr 22, 2024
Apr 22, 2024
Apr 22, 2024
Jan 4, 2024
Jan 4, 2024
Jan 4, 2024
Jan 4, 2024
Jan 4, 2024
Jan 4, 2024
May 24, 2023
May 24, 2023
May 24, 2023
May 24, 2023
May 24, 2023
Mar 13, 2023
Mar 13, 2023
Oct 27, 2022
Oct 27, 2022
Oct 27, 2022
Oct 27, 2022
Oct 27, 2022
Jun 27, 2022
Jun 27, 2022
Jun 22, 2022
Nov 10, 2021
Nov 10, 2021
Oct 6, 2020
Oct 6, 2020
Oct 6, 2020
Oct 6, 2020
Oct 6, 2020
Jun 4, 2020
May 29, 2020
Mar 27, 2020
Mar 10, 2020
Mar 10, 2020
Mar 10, 2020
Mar 10, 2020
Feb 28, 2020
Sep 2, 2019
Sep 2, 2019
Sep 2, 2019
Sep 2, 2019
Sep 2, 2019
Aug 29, 2019
Aug 29, 2019
Aug 29, 2019
Aug 29, 2019
Aug 29, 2019
Jul 29, 2019
Apr 25, 2019
Feb 19, 2019
Feb 15, 2019
Feb 15, 2019
Feb 1, 2019
Feb 1, 2019
Jan 31, 2019
Nov 23, 2018
Feb 5, 2018
Jan 18, 2018
Jan 18, 2018