Method and system for low-temperature air separation
US-2022228804-A1 · Jul 21, 2022 · US
of nitrogen
of nitrogen · 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 | F25J3/04084 |
| Official title | {of nitrogen} |
| Display label | of nitrogen |
| Total patents | 92 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 3 |
| 2017 | 8 |
| 2018 | 7 |
| 2019 | 13 |
| 2020 | 12 |
| 2021 | 12 |
| 2022 | 6 |
| 2023 | 10 |
| 2024 | 7 |
| 2025 | 9 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for obtaining one or more air products, and air separation unit
US-2021381762-A1 · Dec 9, 2021 · US
Method and unit for low-temperature air separation
US-2021381761-A1 · Dec 9, 2021 · US
Method and apparatus for the cryogenic separation of air
US-11193710-B2 · Dec 7, 2021 · US
Method and apparatus for the cryogenic separation of air
US-11175091-B2 · Nov 16, 2021 · US
Method and device for generating gaseous compressed nitrogen
US-11118834-B2 · Sep 14, 2021 · US
Process for obtaining one or more air products and air separation plant
US-11098950-B2 · Aug 24, 2021 · US
Process and apparatus for separating air using a split heat exchanger
US-11054182-B2 · Jul 6, 2021 · US
Cryogenic rectification process-based method for producing air product, and air separation system
US-2021140708-A1 · May 13, 2021 · US
Method and apparatus for obtaining a compressed gas product by cryogenic separation of air
US-10995983-B2 · May 4, 2021 · US
Apparatus for the distillation of air by cryogenic distillation
US-10969167-B2 · Apr 6, 2021 · US
Utilization of nitrogen-enriched streams produced in air separation units comprising split-core main heat exchangers
US-2021055049-A1 · Feb 25, 2021 · US
Annular divided wall column
US-10928129-B2 · Feb 23, 2021 · US
Annular divided wall column with ring shaped collectors and distributers
US-10866025-B2 · Dec 15, 2020 · US
Annular divided wall column
US-10866026-B2 · Dec 15, 2020 · US
Distillation column system and plant for production of oxygen by cryogenic fractionation of air
US-10845118-B2 · Nov 24, 2020 · US
Annular divided wall column for an air separation unit
US-10684071-B2 · Jun 16, 2020 · US
System and method for enhanced recovery of argon and oxygen from a nitrogen producing cryogenic air separation unit
US-10663224-B2 · May 26, 2020 · US
Integration of hydrogen liquefaction with gas processing units
US-2020141637-A1 · May 7, 2020 · US
Integration of hydrogen liquefaction with gas processing units
US-2020141640-A1 · May 7, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F25J3/04084?
- CPC F25J3/04084 is the Cooperative Patent Classification code for “of nitrogen.”
- How many patents are filed under CPC F25J3/04084 (of nitrogen)?
- Our database includes 92 publications tagged with this CPC code.
- Is patent activity under CPC F25J3/04084 growing?
- Publication counts under this code: 7 in 2024 vs 9 in 2025 (latest complete years).