System and method of generating hydrogen gas
US-12559401-B2 · Feb 24, 2026 · US
Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00)
Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00) · 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 | C01F5/40 |
| Official title | Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00) |
| Display label | Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00) |
| Total patents | 31 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 5 |
| 2017 | 4 |
| 2018 | 6 |
| 2019 | 3 |
| 2021 | 1 |
| 2022 | 4 |
| 2024 | 1 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System and method of generating electricity in a body of water
US-12441644-B2 · Oct 14, 2025 · US
System and method of separating oxygen from a body of water
US-12428328-B2 · Sep 30, 2025 · US
Method for producing scorodite
US-12252412-B2 · Mar 18, 2025 · US
Method for recovering magnesium by using sediment and sulfuric acid generated in electrolytic chlorine generation system using seawater and brackish water
US-2024360536-A1 · Oct 31, 2024 · US
Method for producing scorodite
US-2022234909-A1 · Jul 28, 2022 · US
System and Method of Separating Oxygen from A Body of Water
US-2022194833-A1 · Jun 23, 2022 · US
System and Method of Generating Electricity in A Body of Water
US-2022200029-A1 · Jun 23, 2022 · US
System and Method of Generating Hydrogen Gas
US-2022194786-A1 · Jun 23, 2022 · US
Enhanced surfactant polymer flooding processes for oil recovery in carbonate reservoirs
US-11041109-B2 · Jun 22, 2021 · US
Process for treating a sulfurous fluid to form gypsum and magnesium carbonate
US-10399862-B2 · Sep 3, 2019 · US
Enhanced surfactant polymer flooding processes for oil recovery in carbonate reservoirs
US-2019194524-A1 · Jun 27, 2019 · US
Pre-treatment agent and pre-treatment method for antithrombin iii to be subjected to limulus test
US-2019025309-A1 · Jan 24, 2019 · US
Pre-treatment agent and pre-treatment method for antithrombin III to be subjected to limulus test
US-10132812-B2 · Nov 20, 2018 · US
Controlled process for precipitating calcium carbonate and vaterite precipitated calcium carbonate compositions formed by said process
US-2018265370-A1 · Sep 20, 2018 · US
A controlled process for precipitating polymorphs of calcium carbonate
US-2018265371-A1 · Sep 20, 2018 · US
Hematite manufacturing process and hematite manufactured by same
US-9938158-B2 · Apr 10, 2018 · US
A controlled process for precipitating calcium carbonate
US-2018022614-A1 · Jan 25, 2018 · US
A process for treating a sulfurous fluid to form gypsum and magnesium carbonate
US-2018002187-A1 · Jan 4, 2018 · US
A process for converting natural calcium carbonate into precipitated calcium carbonate
US-2017369329-A1 · Dec 28, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01F5/40?
- CPC C01F5/40 is the Cooperative Patent Classification code for “Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00).”
- How many patents are filed under CPC C01F5/40 (Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00))?
- Our database includes 31 publications tagged with this CPC code.
- Is patent activity under CPC C01F5/40 growing?
- Publication counts under this code: 1 in 2024 vs 3 in 2025 (latest complete years).