Method for producing chlorofluorobutane (cfb)
US-2026055039-A1 · Feb 26, 2026 · US
Halogenated butadienes
Halogenated butadienes · 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 | C07C21/20 |
| Official title | Halogenated butadienes |
| Display label | Halogenated butadienes |
| Total patents | 30 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2019 | 4 |
| 2020 | 3 |
| 2021 | 9 |
| 2022 | 6 |
| 2024 | 2 |
| 2025 | 4 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for producing 1,1,1,4,4,4-hexafluorobut-2-ene
US-2026042721-A1 · Feb 12, 2026 · US
Process for producing 1,1,1,4,4,4-hexafluorobut-2-ene
US-12421181-B2 · Sep 23, 2025 · US
Processes for producing Z-1,1,1,4,4,4-hexafluorobut-2-ene and intermediates for producing same
US-12421180-B2 · Sep 23, 2025 · US
A process for the purification of fluorinated olefins in gas phase
US-2025269315-A1 · Aug 28, 2025 · US
Method for producing hexafluoro-1,3-butadiene
US-2025011261-A1 · Jan 9, 2025 · US
Processes for producing Z-1,1,1,4,4,4-hexafluorobut-2-ene and intermediates for producing same
US-11912639-B2 · Feb 27, 2024 · US
A process for the purification of fluorinated olefins
US-2024025825-A1 · Jan 25, 2024 · US
Processes for producing z-1,1,1,4,4,4-hexafluorobut-2-ene and intermediates for producing same
US-2022194879-A1 · Jun 23, 2022 · US
Processes for producing z-1,1,1,4,4,4-hexafluorobut-2-ene and intermediates for producing same
US-2022194882-A1 · Jun 23, 2022 · US
Processes for producing z-1,1,1,4,4,4-hexafluorobut-2-ene and intermediates for producing same
US-2022194881-A1 · Jun 23, 2022 · US
Process for producing 1,1,1,4,4,4-hexafluorobut-2-ene
US-2022162141-A1 · May 26, 2022 · US
Plasma etching method and plasma etching apparatus
US-2022084835-A1 · Mar 17, 2022 · US
Method for producing perfluoroalkadiene compounds
US-11225446-B2 · Jan 18, 2022 · US
Production method for hexafluoro-1,3-butadiene
US-11192838-B2 · Dec 7, 2021 · US
Method for producing hexafluoro-1,3-butadiene
US-11117850-B2 · Sep 14, 2021 · US
Method for producing hexafluorobutadiene
US-11097997-B2 · Aug 24, 2021 · US
Method for producing perfluoroalkadiene compounds
US-2021221757-A1 · Jul 22, 2021 · US
Method of producing compound having butadiene skeleton containing hydrogen and fluorine and/or chlorine
US-11046629-B2 · Jun 29, 2021 · US
Production method for hexafluoro-1,3-butadiene
US-2021163382-A1 · Jun 3, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C21/20?
- CPC C07C21/20 is the Cooperative Patent Classification code for “Halogenated butadienes.”
- How many patents are filed under CPC C07C21/20 (Halogenated butadienes)?
- Our database includes 30 publications tagged with this CPC code.
- Is patent activity under CPC C07C21/20 growing?
- Publication counts under this code: 2 in 2024 vs 4 in 2025 (latest complete years).