Energy conversion apparatus
US-11629663-B2 · Apr 18, 2023 · US
the engine being of the free piston type
the engine being of the free piston type · 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 | F02G1/0435 |
| Official title | {the engine being of the free piston type} |
| Display label | the engine being of the free piston type |
| Total patents | 71 |
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 | 9 |
| 2017 | 2 |
| 2018 | 7 |
| 2019 | 5 |
| 2020 | 13 |
| 2021 | 9 |
| 2022 | 9 |
| 2023 | 6 |
| 2024 | 4 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
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
Pressure boost system
US-2022186679-A1 · Jun 16, 2022 · US
Electric propulsion system of an aircraft
US-2022177146-A1 · Jun 9, 2022 · US
Monolithic heat-exchanger bodies
US-11346302-B2 · May 31, 2022 · US
Energy conversion apparatus
US-11268476-B2 · Mar 8, 2022 · US
Energy conversion apparatus
US-2022034281-A1 · Feb 3, 2022 · US
Heat-assisted pumping systems for use in negative pressure wound therapy
US-2022000672-A1 · Jan 6, 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
Stirling cycle machine
US-11079145-B2 · Aug 3, 2021 · US
Heat-assisted pumping systems for use in negative pressure wound therapy
US-11071653-B2 · Jul 27, 2021 · US
Monolithic heater bodies
US-11022068-B2 · Jun 1, 2021 · US
Energy conversion apparatus and control system
US-10961949-B2 · Mar 30, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F02G1/0435?
- CPC F02G1/0435 is the Cooperative Patent Classification code for “the engine being of the free piston type.”
- How many patents are filed under CPC F02G1/0435 (the engine being of the free piston type)?
- Our database includes 71 publications tagged with this CPC code.
- Is patent activity under CPC F02G1/0435 growing?
- Publication counts under this code: 4 in 2024 vs 4 in 2025 (latest complete years).