Patent No. EP3531095 (titled "Heat Cost Allocator Device") was filed by Iott IPR on Feb 27, 2019. The application was issued on Dec 23, 2020.

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 |
|---|---|---|
| ISTA | Jul 27, 2021 | COHAUSZ HANNIG BORKOWSKI WISSGOTT |
| TECHEM ENERGY SERVICES | Jul 20, 2021 | KEIL & SCHAAFHAUSEN PATENTANWALTE PARTGMBB |
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.
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