Multi-temperature double-acting piston
US-12203427-B2 · Jan 21, 2025 · US
Piston assemblies
Piston assemblies · 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 | F02G2270/40 |
| Official title | Piston assemblies |
| Display label | Piston assemblies |
| Total patents | 39 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2017 | 1 |
| 2019 | 1 |
| 2020 | 12 |
| 2021 | 8 |
| 2022 | 7 |
| 2023 | 6 |
| 2024 | 2 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Reciprocating heat engine with hot cylinder head and cold cylinder
US-12000357-B2 · Jun 4, 2024 · US
Beta-type Stirling machine
US-11952960-B2 · Apr 9, 2024 · US
Moteur thermique alternatif a culasse chaude et cylindre froid
US-2023304456-A1 · Sep 28, 2023 · US
Piston a double effet multitemperature
US-2023258145-A1 · Aug 17, 2023 · US
Constant density heat exchanger and system for energy conversion
US-2023228229-A1 · Jul 20, 2023 · US
Energy conversion apparatus
US-11629663-B2 · Apr 18, 2023 · US
Constant density heat exchanger and system for energy conversion
US-11608795-B2 · Mar 21, 2023 · US
Energy conversion apparatus
US-2023019495-A1 · Jan 19, 2023 · US
Monolithic heat-exchanger bodies
US-2022290630-A1 · Sep 15, 2022 · US
System and apparatus for energy conversion
US-2022213847-A1 · Jul 7, 2022 · US
Engine apparatus and method for operation
US-2022195959-A1 · Jun 23, 2022 · US
Monolithic heat-exchanger bodies
US-11346302-B2 · May 31, 2022 · US
Energy conversion apparatus
US-11268476-B2 · Mar 8, 2022 · US
Beta-type stirling machine
US-2022065193-A1 · Mar 3, 2022 · US
Energy conversion apparatus
US-2022034281-A1 · Feb 3, 2022 · US
Constant density heat exchanger and system for energy conversion
US-2021381467-A1 · Dec 9, 2021 · US
Monolithic combustor bodies
US-11181072-B2 · Nov 23, 2021 · US
Energy conversion apparatus
US-11174814-B2 · Nov 16, 2021 · US
Constant density heat exchanger and system for energy conversion
US-11125184-B2 · Sep 21, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F02G2270/40?
- CPC F02G2270/40 is the Cooperative Patent Classification code for “Piston assemblies.”
- How many patents are filed under CPC F02G2270/40 (Piston assemblies)?
- Our database includes 39 publications tagged with this CPC code.
- Is patent activity under CPC F02G2270/40 growing?
- Publication counts under this code: 2 in 2024 vs 1 in 2025 (latest complete years).