Process for simultaneous removal of hydrogen sulfide and heavy metals
US-12415726-B2 · Sep 16, 2025 · US
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Purification
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 | C01B17/168 |
| Official title | {Purification} |
| Display label | Purification |
| Total patents | 19 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2019 | 2 |
| 2020 | 2 |
| 2021 | 2 |
| 2022 | 2 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydrogen sulfide purification method and lithium sulfide production method
US-2025178897-A1 · Jun 5, 2025 · US
Method for purifying hydrogen sulfide and method for producing lithium sulfide
US-2025178898-A1 · Jun 5, 2025 · US
Producing hydrogen from hydrogen sulfide
US-2024327208-A1 · Oct 3, 2024 · US
Hydrogen sulfide purification method, lithium sulfide production method, hydrogen sulfide purification device, and lithium sulfide production device
US-2024270575-A1 · Aug 15, 2024 · US
Process for simultaneous removal of hydrogen sulfide and heavy metals
US-2024124305-A1 · Apr 18, 2024 · US
Adsorption-based Claus tail gas treatment through regeneration temperature ramping
US-11572274-B2 · Feb 7, 2023 · US
Process and plant for producing a plurality of gas products from shifted and unshifted crude synthesis gas
US-11555158-B2 · Jan 17, 2023 · US
Hydrogen sulfide production method and sulfur recovery method
US-11459236-B2 · Oct 4, 2022 · US
Adsorption-Based Claus Tail Gas Treatment through Regeneration Temperature Ramping
US-2022242729-A1 · Aug 4, 2022 · US
Process and plant for producing a plurality of gas products from shifted and unshifted crude synthesis gas
US-2021269728-A1 · Sep 2, 2021 · US
Hydrogen sulfide production method and sulfur recovery method
US-2021053828-A1 · Feb 25, 2021 · US
Processes for removing polysulfanes and elemental sulfur from hydrogen sulfide
US-10773958-B2 · Sep 15, 2020 · US
System for tail gas treatment of sulfur recovery units
US-10556805-B2 · Feb 11, 2020 · US
System for Tail Gas Treatment of Sulfur Recovery Units
US-2019169039-A1 · Jun 6, 2019 · US
System for tail gas treatment of sulfur recovery units
US-10239763-B1 · Mar 26, 2019 · US
Hydrogen sulfide gas production plant and method for recovering and using waste hydrogen sulfide gas
US-9480956-B2 · Nov 1, 2016 · US
Processes for Removing Polysulfanes and Elemental Sulfur from Hydrogen Sulfide
US-2015266734-A1 · Sep 24, 2015 · US
Hydrogen sulfide gas production plant and method for recovering and using waste hydrogen sulfide gas
US-2015044126-A1 · Feb 12, 2015 · US