Systems and methods for removing nitrogen during liquefaction of natural gas
US-12455114-B2 · Oct 28, 2025 · US
using a deep flash recycle loop
using a deep flash recycle loop · 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 | F25J1/021 |
| Official title | {using a deep flash recycle loop} |
| Display label | using a deep flash recycle loop |
| Total patents | 62 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 10 |
| 2017 | 8 |
| 2018 | 7 |
| 2019 | 3 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 9 |
| 2024 | 6 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for converting carbon dioxide into sng or lng and storing hydrogen
US-2025270722-A1 · Aug 28, 2025 · US
Integrated liquid recovery process in lng processes
US-2024377128-A1 · Nov 14, 2024 · US
Two-stage heavies removal in lng processing
US-12111101-B2 · Oct 8, 2024 · US
Solvent injection and recovery in a lng plant
US-2024310118-A1 · Sep 19, 2024 · US
Solvent injection and recovery in a LNG plant
US-12025371-B2 · Jul 2, 2024 · US
Refrigerant supply to a cooling facility
US-2024093936-A1 · Mar 21, 2024 · US
Refrigerant supply to a cooling facility
US-11874055-B2 · Jan 16, 2024 · US
Closed loop lng process for a feed gas with nitrogen
US-2023375261-A1 · Nov 23, 2023 · US
Facility and method for refrigerating a fluid
US-2023304731-A1 · Sep 28, 2023 · US
Solvent injection and recovery in a lng plant
US-2023251032-A1 · Aug 10, 2023 · US
Apparatus for large hydrogen liquefaction system
US-2023194159-A1 · Jun 22, 2023 · US
Solvent injection and recovery in a LNG plant
US-11662141-B2 · May 30, 2023 · US
Mitigation of Shell-Side Liquid Maldistribution in Coil Wound Heat Exchanger Bundles
US-2023147084-A1 · May 11, 2023 · US
Solvent injection for solids prevention in an lng plant
US-2023024241-A1 · Jan 26, 2023 · US
Method for large hydrogen liquefaction system
US-2023009727-A1 · Jan 12, 2023 · US
Producing LNG from Methane Containing Synthetic Gas
US-2023003444-A1 · Jan 5, 2023 · US
Heat exchanger for a liquefied natural gas facility
US-2022364787-A1 · Nov 17, 2022 · US
Heat exchanger for a liquefied natural gas facility
US-11435138-B2 · Sep 6, 2022 · US
Process composition analysis via online mass spectrometry
US-2022122830-A1 · Apr 21, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F25J1/021?
- CPC F25J1/021 is the Cooperative Patent Classification code for “using a deep flash recycle loop.”
- How many patents are filed under CPC F25J1/021 (using a deep flash recycle loop)?
- Our database includes 62 publications tagged with this CPC code.
- Is patent activity under CPC F25J1/021 growing?
- Publication counts under this code: 6 in 2024 vs 3 in 2025 (latest complete years).