F24D 2220/025
Check valves
F24D2220/025 (Check valves) appears on 13 US grants and 21 published applications in this corpus.
Search patents in F24D- Granted patents
- 13
- Published applications
- 21
- Assignees
- 16
- Inventors
- 52
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
| 2020 | 2 | 4 |
| 2021 | 1 | 0 |
| 2022 | 2 | 3 |
| 2023 | 0 | 1 |
| 2024 | 2 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 4 |
By publication year. 2026 runs to 8 Oct.
Recent patents
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- Receiver, connection method thereof, receiver assembly and heat pump system16 Sep 2025US 12,416,435 B2Carrier Corporation
- Air heating apparatus4 Mar 2025US 12,241,641 B2Kyungdong Navien Co., Ltd.
- Integrated recirculation pump for non-condensing water heater2 Jul 2024US 12,025,322 B2Rinnai America Corporation
- Receiver, connection method thereof, receiver assembly and heat pump system18 Jun 2024US 12,013,158 B2Carrier Corporation
- Heating Circuit and Degassing Device17 Sep 2026US 2026/0276214 A1Viessmann Holding International GmbH
- Multi-system water heater module and heat pump system21 May 2026US 2026/0139847 A1Ningbo Aux Electric Co., Ltd.
- Booster box standalone feed system26 Mar 2026US 2026/0085844 A1Neutrasafe LLC
- Water heater dip tube26 Mar 2026US 2026/0085858 A1A. O. Smith (China) Water Heater Company Ltd.
- Water heating system20 Nov 2025US 2025/0354719 A1Mixergy Limited
Most cited
By later US patents
- Water delivery system10US 10,612,793 B1AquaMotion, Inc. · 2020
- Solar thermal system5US 9,400,122 B2Kyungdong Navien Co., Ltd. · 2016
- Hot water supply system having preheating function and method for controlling same1US 10,648,680 B2Kyungdong Navien Co., Ltd. · 2020
- Recirculating fluid heating systems1US 10,900,668 B2Heatworks Technologies, Inc. · 2021
- Integrated recirculation pump for non-condensing water heater1US 11,486,586 B2Rinnai America Corporation · 2022