Patent No. EP3138820 (titled "Apparatus And Method For Pre-Heating Feedstock To A Melter Using Melter Exhaust") was filed by Johns Manville on Sep 2, 2016. The application was issued on May 8, 2019.

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 |
|---|---|---|
| SAINT GOBAIN | Feb 5, 2020 | SAINT GOBAIN RECHERCHE |
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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