Concentration of sulfuric acid
US-12577104-B2 · Mar 17, 2026 · US
Separation; Purification
Separation; Purification · 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 | C01B17/90 |
| Official title | Separation; Purification |
| Display label | Separation; Purification |
| Total patents | 26 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 4 |
| 2018 | 4 |
| 2019 | 1 |
| 2020 | 2 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 3 |
| 2024 | 2 |
| 2025 | 3 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for recycling sulfuric acid
US-2026015264-A1 · Jan 15, 2026 · US
Methanol and sulfuric acid co-production system
US-12496533-B2 · Dec 16, 2025 · US
Method of cleaning an apparatus used in the concentration of a mineral acid
US-12441614-B2 · Oct 14, 2025 · US
Sulfuric acid recovery device and method for recovering sulfuric acid
US-2025066196-A1 · Feb 27, 2025 · US
Device and method for recycling sulfuric acid
US-2024327249-A1 · Oct 3, 2024 · US
Method for treating waste plastic based on persulfate system
US-2024262974-A1 · Aug 8, 2024 · US
Methanol and sulfuric acid co-production system
US-2023174443-A1 · Jun 8, 2023 · US
Concentration of sulfuric acid
US-2023117014-A1 · Apr 20, 2023 · US
Method of cleaning an apparatus used in the concentration of a mineral acid
US-2023016848-A1 · Jan 19, 2023 · US
Process for the removal of particulate matter from an aqueous stream
US-2022401863-A1 · Dec 22, 2022 · US
Processes useful in the manufacture of cyclododecasulfur
US-2022169506-A1 · Jun 2, 2022 · US
Porous membrane having a fluorinated copolymer as surface treatment
US-11040312-B2 · Jun 22, 2021 · US
Porous membrane having a fluorinated copolymer as surface treatment
US-2020353427-A1 · Nov 12, 2020 · US
Process for production of sulfuric acid
US-10829376-B2 · Nov 10, 2020 · US
Process for making cyclohexanone and/or phenol
US-10294178-B2 · May 21, 2019 · US
Treating sulfuric acid
US-10138124-B2 · Nov 27, 2018 · US
Process for production of sulfuric acid
US-2018127271-A1 · May 10, 2018 · US
Treating sulfuric acid
US-2018079645-A1 · Mar 22, 2018 · US
Process for Making Cyclohexanone and/or Phenol
US-2018065903-A1 · Mar 8, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C01B17/90?
- CPC C01B17/90 is the Cooperative Patent Classification code for “Separation; Purification.”
- How many patents are filed under CPC C01B17/90 (Separation; Purification)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC C01B17/90 growing?
- Publication counts under this code: 2 in 2024 vs 3 in 2025 (latest complete years).