Acid corrosion inhibitors
US-11981861-B2 · May 14, 2024 · US
Quaternary ammonium compounds
Quaternary ammonium compounds · 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 | C09K23/18 |
| Official title | Quaternary ammonium compounds |
| Display label | Quaternary ammonium compounds |
| Total patents | 85 |
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 | 5 |
| 2016 | 10 |
| 2017 | 9 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 5 |
| 2021 | 3 |
| 2022 | 14 |
| 2023 | 8 |
| 2024 | 11 |
| 2025 | 7 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Porous polyurethane for consolidation of material in subterranean formations
US-11939517-B2 · Mar 26, 2024 · US
Controlled reaction rates of thermochemical fluids using emulsions
US-2023374385-A1 · Nov 23, 2023 · US
Coating process by ion exchange
US-11759819-B2 · Sep 19, 2023 · US
Solubilizing agent and solubilizing solution
US-2023250341-A1 · Aug 10, 2023 · US
Halogen-free quaternary amines and uses thereof
US-11542199-B2 · Jan 3, 2023 · US
Amphoteric compounds
US-2022356151-A1 · Nov 10, 2022 · US
Porous polyurethane for consolidation of material in subterranean formations
US-2022348814-A1 · Nov 3, 2022 · US
Method for preparing an inverse emulsion comprising two cationic polymers
US-2022348847-A1 · Nov 3, 2022 · US
Method and material to reduce acid-carbonate reaction rate by endothermic reaction
US-2022348815-A1 · Nov 3, 2022 · US
Acid corrosion inhibitors
US-2022333002-A1 · Oct 20, 2022 · US
Amidoamine-based gemini surfactant containing ethoxylate units and a method for oil recovery
US-11459499-B2 · Oct 4, 2022 · US
Amphoteric compounds
US-11414380-B2 · Aug 16, 2022 · US
Surfactant composition for foaming sand
US-2022228067-A1 · Jul 21, 2022 · US
Methods and formulations for enhanced oil recovery
US-2022169914-A1 · Jun 2, 2022 · US
Stabilizer concentrates for wax dispersions
US-2022160592-A1 · May 26, 2022 · US
Exfoliated layer dispersion of layered compound, and transparent substrate using same
US-2022089880-A1 · Mar 24, 2022 · US
Surfactant composition
US-2022072490-A1 · Mar 10, 2022 · US
Surfactant composition
US-2022062134-A1 · Mar 3, 2022 · US
Fatty amine type emulsifiers and their use in asphalt emulsions and applications
US-2022001345-A1 · Jan 6, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C09K23/18?
- CPC C09K23/18 is the Cooperative Patent Classification code for “Quaternary ammonium compounds.”
- How many patents are filed under CPC C09K23/18 (Quaternary ammonium compounds)?
- Our database includes 85 publications tagged with this CPC code.
- Is patent activity under CPC C09K23/18 growing?
- Publication counts under this code: 11 in 2024 vs 7 in 2025 (latest complete years).