Sustainable hybrid composite made from biodegradable polymer reinforced with Extracted Powder Compound from Reject Brine (EPC-RB)
US-12583772-B2 · Mar 24, 2026 · US
Purification of calcium sulfates
Purification of calcium sulfates · 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 | C01F11/468 |
| Official title | {Purification of calcium sulfates} |
| Display label | Purification of calcium sulfates |
| Total patents | 35 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 4 |
| 2018 | 7 |
| 2019 | 2 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 5 |
| 2024 | 2 |
| 2025 | 4 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing phosphoric acid and calcium sulphate quality suitable for a clinker process for the commercial and industrial utilization of calcium sulphate
US-12583747-B2 · Mar 24, 2026 · US
Method for compression of aqueous slurry containing solid foreign matter and paper dust, and treatment method of waste gypsum board
US-12559380-B2 · Feb 24, 2026 · US
Method for manufacturing sodium bicarbonate and gypsum using sodium sulfate
US-2026001773-A1 · Jan 1, 2026 · US
Method for separating and purifying phosphoric acid and phosphogypsum from wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby
US-12434977-B2 · Oct 7, 2025 · US
Sustainable hybrid composite made from biodegradable polymer reinforced with extracted powder compound from reject brine (epc-rb)
US-2025304475-A1 · Oct 2, 2025 · US
Crystallization method of gypsum
US-12410095-B2 · Sep 9, 2025 · US
Method for separating and purifying phosphoric acid and phosphogypsum from wet-process phosphoric acid slurry, and phosphoric acid and phosphogypsum prepared thereby
US-2025162899-A1 · May 22, 2025 · US
A crystallization method of gypsum
US-2024199482-A1 · Jun 20, 2024 · US
A process for the continuous preparation of alpha-calcium sulphate hemihydrate and an apparatus
US-2024124319-A1 · Apr 18, 2024 · US
Integrated method for producing sulphur dioxide quality suitable for a sulphuric acid process from calcium sulphate/phosphogypsum from phosphoric acid production
US-11845657-B2 · Dec 19, 2023 · US
Method for producing phosphoric acid and calcium sulphate quality suitable for a clinker process for the commercial and industrial utilization of calcium sulphate
US-2023373789-A1 · Nov 23, 2023 · US
Method for compression of aqueous slurry containing solid foreign matter and paper dust, and treatment method of waste gypsum board
US-2023257277-A1 · Aug 17, 2023 · US
Integrated method for producing sulphur dioxide quality suitable for a sulphuric acid process from calcium sulphate/phosphogypsum from phosphoric acid production
US-2023126633-A1 · Apr 27, 2023 · US
Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid
US-2023039227-A1 · Feb 9, 2023 · US
Method of treating wastewater
US-11505480-B2 · Nov 22, 2022 · US
Method for production of ammonium phosphate from phosphate rock slurry
US-11261088-B2 · Mar 1, 2022 · US
Method for finely processing nonmetallic mineral
US-2021380490-A1 · Dec 9, 2021 · US
Method for production of ammonium phosphate from phosphate rock slurry
US-2021114878-A1 · Apr 22, 2021 · US
Method of treating wastewater
US-2021070637-A1 · Mar 11, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01F11/468?
- CPC C01F11/468 is the Cooperative Patent Classification code for “Purification of calcium sulfates.”
- How many patents are filed under CPC C01F11/468 (Purification of calcium sulfates)?
- Our database includes 35 publications tagged with this CPC code.
- Is patent activity under CPC C01F11/468 growing?
- Publication counts under this code: 2 in 2024 vs 4 in 2025 (latest complete years).