A method for producing ferrous sulphate and phosphoric acid
US-2026070788-A1 · Mar 12, 2026 · US
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Phosphoric acid
Phosphoric acid · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C01B25/18 |
| Official title | Phosphoric acid |
| Display label | Phosphoric acid |
| Total patents | 19 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 3 |
| 2017 | 3 |
| 2019 | 1 |
| 2020 | 3 |
| 2021 | 2 |
| 2024 | 3 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Surface treatment method, sequencing method, and kit
US-2025257385-A1 · Aug 14, 2025 · US
Phospate recovery by acid retardation
US-12168618-B2 · Dec 17, 2024 · US
Solutions and gels of one-dimensional metal oxides
US-2024376320-A1 · Nov 14, 2024 · US
Manufacturing apparatus for lithium sulfate and manufacturing method therefor
US-11932549-B2 · Mar 19, 2024 · US
Manufacturing apparatus for lithium sulfate and manufacturing method therefor
US-2021300774-A1 · Sep 30, 2021 · US
Modified amines useful as scale inhibitors in wet process phosphoric acid production
US-10906828-B2 · Feb 2, 2021 · US
Phospate recovery by acid retardation
US-2020377386-A1 · Dec 3, 2020 · US
Phosphate recovery by acid retardation
US-10843941-B2 · Nov 24, 2020 · US
Process for recovering phosphorous from phosphoritic materials
US-2020048092-A1 · Feb 13, 2020 · US
Substrate treating method for a substrate treating apparatus that carries out etching treatment of substrates
US-10520416-B2 · Dec 31, 2019 · US
Membranes, azeotropic and catalytic components
US-9731969-B2 · Aug 15, 2017 · US
Method for measuring silicon concentration in a phosphoric acid aqueous solution
US-2017160181-A1 · Jun 8, 2017 · US
Phosphate Recovery by Acid Retardation
US-2017015568-A1 · Jan 19, 2017 · US
Modified amines useful as scale inhibitors in wet process phosphoric acid production
US-2016229725-A1 · Aug 11, 2016 · US
Recovery of phosphorus values and salt impurities from aqueous waste streams
US-9394173-B2 · Jul 19, 2016 · US
Treatment process of phosphorous pentafluoride
US-2016158696-A1 · Jun 9, 2016 · US
Phosphoric acid production gypsum filtration flocculant pre-dilution (make down) with post-filtration phosphoric acid
US-9187327-B2 · Nov 17, 2015 · US
Membranes, azeotropic & catalytic components
US-2015225240-A1 · Aug 13, 2015 · US