Patent No. EP3861877 (titled "Heated Aerosol-Generating Device And Method For Generating Aerosol With Consistent Properties") was filed by Philip Morris on Dec 17, 2013. The application was issued on Feb 8, 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 |
|---|---|---|
| BRITISH AMERICAN TOBACCO | Nov 8, 2023 | DEHNS |
| JAPAN TOBACCO | Nov 8, 2023 | BARDEHLE PAGENBERG PARTNERSCHAFT MBB PATENTANWALTE RECHTSANWALTE |
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