Patent No. EP3671153 (titled "Method For Determining An Expected Value Of A Nominal Output Of An Unknown Heating Body And An Expected Value Of At Least One Thermal Coupling Parameter Of An Electronic Heating Cost Distributor On The Unknown Heating Body And Parameterization Method For Parameterizing An Electronic Heating Cost Distributor") was filed by Qundis on Dec 5, 2019. The application was issued on May 10, 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 |
|---|---|---|
| TECHEM ENERGY SERVICES | Feb 11, 2024 | KEIL & SCHAAFHAUSEN PATENTANWALTE PARTGMBB |
| METRONA UNION | Feb 9, 2024 | PRINZ & PARTNER MBB |
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