Gas turbine engine with carbon/carbon composite piston seal
US-12535013-B2 · Jan 27, 2026 · US
Double or plural piston ring arrangements, i.e. two or more piston rings
Double or plural piston ring arrangements, i.e. two or more piston rings · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F05D2240/581 |
| Official title | Double or plural piston ring arrangements, i.e. two or more piston rings |
| Display label | Double or plural piston ring arrangements, i.e. two or more piston rings |
| Total patents | 33 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 2 |
| 2017 | 5 |
| 2018 | 4 |
| 2019 | 4 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 1 |
| 2024 | 3 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Shaft sealing device and rotary machine
US-12247490-B2 · Mar 11, 2025 · US
Annular seal with interlocked rings
US-2025003349-A1 · Jan 2, 2025 · US
Shaft sealing device and rotary machine
US-2024344463-A1 · Oct 17, 2024 · US
Internal combustion engine system
US-12012862-B2 · Jun 18, 2024 · US
Gas turbine engine with carbon/carbon composite piston seal
US-2024175369-A1 · May 30, 2024 · US
Internal combustion engine system
US-2023021590-A1 · Jan 26, 2023 · US
Bearing compartment seal configuration for a gas turbine engine
US-11499442-B2 · Nov 15, 2022 · US
Seal assembly with anti-rotation lock
US-11365640-B2 · Jun 21, 2022 · US
Extended pilot ring seal arrangement for installation damage prevention
US-11125094-B2 · Sep 21, 2021 · US
Ramped spacer ring seal
US-11015715-B2 · May 25, 2021 · US
Seal assembly with anti-rotation lock
US-2021087941-A1 · Mar 25, 2021 · US
Bearing compartment seal configuration for a gas turbine engine
US-2020325788-A1 · Oct 15, 2020 · US
Turbocharger
US-10801368-B2 · Oct 13, 2020 · US
Extended pilot ring seal arrangement for installation damage prevention
US-2020318490-A1 · Oct 8, 2020 · US
Switching bleed valve for a gas turbine engine
US-10487751-B2 · Nov 26, 2019 · US
Ramped spacer ring seal
US-2019293183-A1 · Sep 26, 2019 · US
Switching bleed valve for a gas turbine engine
US-2019101061-A1 · Apr 4, 2019 · US
Circumferential plenum for oil damper
US-10233778-B2 · Mar 19, 2019 · US
Seal with backup seal
US-10161256-B2 · Dec 25, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F05D2240/581?
- CPC F05D2240/581 is the Cooperative Patent Classification code for “Double or plural piston ring arrangements, i.e. two or more piston rings.”
- How many patents are filed under CPC F05D2240/581 (Double or plural piston ring arrangements, i.e. two or more piston rings)?
- Our database includes 33 publications tagged with this CPC code.
- Is patent activity under CPC F05D2240/581 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).