F05D 2240/581
Double or plural piston ring arrangements, i.e. two or more piston rings
F05D2240/581 (Double or plural piston ring arrangements, i.e. two or more piston rings) appears on 22 US grants and 21 published applications in this corpus.
Search patents in F05D- Granted patents
- 22
- Published applications
- 21
- Assignees
- 16
- Inventors
- 57
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2014 | 0 | 3 |
| 2015 | 1 | 2 |
| 2016 | 1 | 1 |
| 2017 | 3 | 2 |
| 2018 | 3 | 1 |
| 2019 | 2 | 2 |
| 2020 | 1 | 2 |
| 2021 | 2 | 1 |
| 2022 | 2 | 3 |
| 2023 | 2 | 1 |
| 2024 | 2 | 2 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Center tie rotor seal26 May 2026US 12,637,953 B1Rtx Corporation
- Gas turbine engine with carbon/carbon composite piston seal27 Jan 2026US 12,535,013 B2Rtx Corporation
- Shaft sealing device and rotary machine11 Mar 2025US 12,247,490 B2Mitsubishi Heavy Industries, Ltd.
- Exhaust gas turbocharger having a hydrodynamic plain bearing or a hydrodynamic plain bearing20 Aug 2024US 12,065,940 B2BMTS Technology GmbH & Co. KG
- Internal combustion engine system18 Jun 2024US 12,012,862 B2Volvo Truck Corporation
- Annular seal with interlocked rings2 Jan 2025US 2025/0003349 A1Raytheon Technologies Corporation
- Shaft sealing device and rotary machine17 Oct 2024US 2024/0344463 A1Mitsubishi Heavy Industries, Ltd.
- Gas turbine engine with carbon/carbon composite piston seal30 May 2024US 2024/0175369 A1Raytheon Technologies Corporation
- Internal combustion engine system26 Jan 2023US 2023/0021590 A1Volvo Truck Corporation
- Reduced emission gas seal28 Jul 2022US 2022/0235790 A1John Crane UK Limited
Most cited
By later US patents
- Gas turbine engine impeller system for an intermediate pressure (IP) compressor10US 9,683,488 B2Rolls-Royce North American Technologies Inc. · 2017
- Gas turbine9US 9,188,062 B2Mitsubishi Hitachi Power Systems, Ltd. · 2015
- Circumferential plenum for oil damper8US 10,233,778 B2United Technologies Corporation · 2019
- Switching bleed valve for a gas turbine engine8US 10,487,751 B2United Technologies Corporation · 2019
- Variable nozzle unit and variable-geometry turbocharger5US 9,618,005 B2IHI Corporation · 2017