Axially spaced restricted damper
US-10458277-B1 · Oct 29, 2019 · US
Piston ring seals
Piston ring seals · 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 | F05D2240/58 |
| Official title | Piston ring seals |
| Display label | Piston ring seals |
| Total patents | 201 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 14 |
| 2017 | 12 |
| 2018 | 16 |
| 2019 | 16 |
| 2020 | 21 |
| 2021 | 21 |
| 2022 | 23 |
| 2023 | 21 |
| 2024 | 17 |
| 2025 | 27 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Anti-rotation shim seal
US-10450882-B2 · Oct 22, 2019 · US
Bearing support assembly
US-2019293293-A1 · Sep 26, 2019 · US
Pressure balanced secondary seal
US-2019249559-A1 · Aug 15, 2019 · US
Device for sealing between the coaxial shafts of a turbomachine
US-10316676-B2 · Jun 11, 2019 · US
Gas turbine engine clearance control
US-10253644-B2 · Apr 9, 2019 · US
Seal assembly for a static structure of a gas turbine engine
US-2019093567-A1 · Mar 28, 2019 · US
Method and device for piston seal anti-rotation
US-10215043-B2 · Feb 26, 2019 · US
Turbocharger with gas and liquid flow paths
US-2019048932-A1 · Feb 14, 2019 · US
Face seal arrangement
US-2019040957-A1 · Feb 7, 2019 · US
Assembly for sealing a gap between components of a turbine engine
US-10196911-B2 · Feb 5, 2019 · US
Seal with backup seal
US-10161256-B2 · Dec 25, 2018 · US
Gas turbine engine ring seal
US-10145308-B2 · Dec 4, 2018 · US
Compliant seal assembly and method of operating
US-2018328209-A1 · Nov 15, 2018 · US
Method for assembling a turbomachine, and turbomachine
US-2018320597-A1 · Nov 8, 2018 · US
Method and system for modulated turbine cooling
US-10113486-B2 · Oct 30, 2018 · US
Pressure regulated piston seal for a gas turbine combustor liner
US-2018306120-A1 · Oct 25, 2018 · US
Reduced friction intershaft seal assembly
US-2018291815-A1 · Oct 11, 2018 · US
Seal assembly for a static structure of a gas turbine engine
US-10087847-B2 · Oct 2, 2018 · US
Composite piston ring seal for axially and circumferentially translating ducts
US-2018238240-A1 · Aug 23, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F05D2240/58?
- CPC F05D2240/58 is the Cooperative Patent Classification code for “Piston ring seals.”
- How many patents are filed under CPC F05D2240/58 (Piston ring seals)?
- Our database includes 201 publications tagged with this CPC code.
- Is patent activity under CPC F05D2240/58 growing?
- Publication counts under this code: 17 in 2024 vs 27 in 2025 (latest complete years).