Cylinder in particular for hydrogen tank cycling facility
US-12546296-B2 · Feb 10, 2026 · US
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free-piston type pumps
free-piston type pumps · 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 | F04B19/003 |
| Official title | {free-piston type pumps} |
| Display label | free-piston type pumps |
| Total patents | 24 |
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 | 2 |
| 2016 | 2 |
| 2017 | 3 |
| 2018 | 3 |
| 2019 | 5 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 4 |
| 2024 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydrogen tank cycling facility
US-2024328916-A1 · Oct 3, 2024 · US
Cylinder in particular for hydrogen tank cycling facility
US-2024328439-A1 · Oct 3, 2024 · US
Active control valve for a fluid pump
US-11486386-B2 · Nov 1, 2022 · US
Free piston linear motor compressor and associated systems of operation
US-11466678-B2 · Oct 11, 2022 · US
Cyclic flow apparatus
US-2022244747-A1 · Aug 4, 2022 · US
Pressure boost system
US-2022186679-A1 · Jun 16, 2022 · US
Active control valve for a fluid pump
US-2021131421-A1 · May 6, 2021 · US
Rotating piston for pumps
US-10859162-B2 · Dec 8, 2020 · US
Fluted piston components for pumps
US-10428942-B2 · Oct 1, 2019 · US
Rotating piston for pumps
US-2019271396-A1 · Sep 5, 2019 · US
Linear compressor
US-10371131-B2 · Aug 6, 2019 · US
Rotating piston for pumps
US-10337614-B2 · Jul 2, 2019 · US
Free piston linear motor compressor and associated systems of operation
US-10323628-B2 · Jun 18, 2019 · US
Submergible cryogenic pump with linear electromagnetic motor drive
US-2018180042-A1 · Jun 28, 2018 · US
Dual-stage cryogenic pump
US-9970421-B2 · May 15, 2018 · US
Free piston linear motor compressor and associated systems of operation
US-2018051690-A1 · Feb 22, 2018 · US
Rotating piston for pumps
US-2017191563-A1 · Jul 6, 2017 · US
Fluted piston components for pumps
US-2017191478-A1 · Jul 6, 2017 · US
Linear compressor
US-2017002801-A1 · Jan 5, 2017 · US