E21F 1/18
Gravity flow ventilation
Official title: Gravity flow ventilation (E21F1/02 - E21F1/16 take precedence)
E21F1/18 (Gravity flow ventilation) appears on 1 US grants and 2 published applications in this corpus.
Search patents in E21F- Granted patents
- 1
- Published applications
- 2
- Assignees
- 2
- Inventors
- 8
- Latest grant
- 11 Feb 2025
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| Year | Granted patents | Published applications |
|---|---|---|
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
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| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
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| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
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