Generating electrical energy from hydrogen and oxygen
US-12595761-B2 · Apr 7, 2026 · US
Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence)
Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence) · 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 | F22D1/003 |
| Official title | {Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence)} |
| Display label | Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence) |
| Total patents | 46 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 8 |
| 2018 | 5 |
| 2019 | 6 |
| 2020 | 3 |
| 2021 | 5 |
| 2022 | 5 |
| 2023 | 2 |
| 2024 | 7 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method and system for steamcracking
US-12552996-B2 · Feb 17, 2026 · US
Combined power generation system and operation control method thereof
US-12258885-B2 · Mar 25, 2025 · US
Electrolyzer system with steam generation and method of operating same
US-2024425993-A1 · Dec 26, 2024 · US
Low-carbon energy utilization system for steam and power cogeneration of oil field
US-12050007-B2 · Jul 30, 2024 · US
STEAM SUPPLY SYSTEM AND STEAM SUPPLY METHOD FOR CAPTURING CARBON dioxide SHIP ONBOARD USING ENGINE COOLANT HEAT SOURCE AND HEAT PUMP
US-2024219083-A1 · Jul 4, 2024 · US
Generating electrical energy from hydrogen and oxygen
US-2024200472-A1 · Jun 20, 2024 · US
Combined power generation system and operation control method thereof
US-2024175394-A1 · May 30, 2024 · US
Method and System for Steamcracking
US-2024158701-A1 · May 16, 2024 · US
Vaporizer and vaporization supply device
US-2024101446-A1 · Mar 28, 2024 · US
Water feedback in vertical forced-flow steam generators
US-11692703-B2 · Jul 4, 2023 · US
High-efficient clean, high-variable load rate coal-fired power generation system and operation method thereof
US-11598524-B2 · Mar 7, 2023 · US
Electrolyzer system with steam generation and method of operating same
US-2022372636-A1 · Nov 24, 2022 · US
Low-carbon energy utilization system for steam and power cogeneration of oil field
US-2022325885-A1 · Oct 13, 2022 · US
Thermoelectric power generator and combustion apparatus
US-11362254-B2 · Jun 14, 2022 · US
High-efficient clean, high-variable load rate coal-fired power generation system and operation method thereof
US-2022146096-A1 · May 12, 2022 · US
Steam power plant, modification method and operation method of steam power plant
US-11236640-B2 · Feb 1, 2022 · US
Vertical heat recovery steam generator
US-11118781-B2 · Sep 14, 2021 · US
Supply-water warming system
US-2021262655-A1 · Aug 26, 2021 · US
Water feedback in vertical forced-flow steam generators
US-2021131312-A1 · May 6, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F22D1/003?
- CPC F22D1/003 is the Cooperative Patent Classification code for “Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence).”
- How many patents are filed under CPC F22D1/003 (Feed-water heater systems (F22D1/325, F22D1/36 and F22D1/40 take precedence))?
- Our database includes 46 publications tagged with this CPC code.
- Is patent activity under CPC F22D1/003 growing?
- Publication counts under this code: 7 in 2024 vs 1 in 2025 (latest complete years).