Closed loop cooling water corrosion inhibition employing polymaleates and non-borate buffers
US-12546014-B2 · Feb 10, 2026 · US
Nitrogen containing compounds
Nitrogen containing 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 | C23F11/181 |
| Official title | {Nitrogen containing compounds} |
| Display label | Nitrogen containing compounds |
| Total patents | 29 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 1 |
| 2019 | 3 |
| 2020 | 6 |
| 2021 | 5 |
| 2022 | 4 |
| 2023 | 3 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Corrosion inhibition of metal reinforcement present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion
US-2025206676-A1 · Jun 26, 2025 · US
Corrosion inhibition of metal reinforcement present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion
US-12281051-B2 · Apr 22, 2025 · US
Inhibitors of metal corrosion
US-11788192-B2 · Oct 17, 2023 · US
Organic blend additive useful for inhibiting localized corrosion of equipment used in oil and gas production
US-11608560-B2 · Mar 21, 2023 · US
Antifreezing coolant composition not including glycol
US-11549044-B2 · Jan 10, 2023 · US
Pretreatment compositions, coated aluminum alloys, and methods of making the same
US-11519076-B2 · Dec 6, 2022 · US
Process for producing sulfonic acid
US-11447450-B2 · Sep 20, 2022 · US
Corrosion Inhibiting Product for Closed Loop Water Systems
US-2022220380-A1 · Jul 14, 2022 · US
Corrosion inhibition of metal reinforcement present in a hardened concrete construction having one or more surfaces that are exposed to chloride intrusion
US-2022194868-A1 · Jun 23, 2022 · US
Closed loop cooling water corrosion inhibition employing polymaleates and non-borate buffers
US-2021371988-A1 · Dec 2, 2021 · US
Antifreezing coolant composition not including glycol
US-2021189214-A1 · Jun 24, 2021 · US
Weakly coloured sulfonic acid
US-11040940-B2 · Jun 22, 2021 · US
Organic blend additive useful for inhibiting localized corrosion of equipment used in oil and gas production
US-2021102298-A1 · Apr 8, 2021 · US
Organic blend additive useful for inhibiting localized corrosion of equipment used in oil and gas production
US-10968524-B2 · Apr 6, 2021 · US
Process for producing sulfonic acid
US-2020347014-A1 · Nov 5, 2020 · US
Inhibitors of metal corrosion
US-2020199764-A1 · Jun 25, 2020 · US
Weakly coloured sulfonic acid
US-2020181072-A1 · Jun 11, 2020 · US
In-line chemical heating for in-situ generation of active chemicals
US-10647928-B2 · May 12, 2020 · US
Organic blend additive useful for inhibiting localized corrosion of equipment used in oil and gas production
US-2020095689-A1 · Mar 26, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C23F11/181?
- CPC C23F11/181 is the Cooperative Patent Classification code for “Nitrogen containing compounds.”
- How many patents are filed under CPC C23F11/181 (Nitrogen containing compounds)?
- Our database includes 29 publications tagged with this CPC code.
- Is patent activity under CPC C23F11/181 growing?
- Publication counts under this code: 3 in 2023 vs 2 in 2025 (latest complete years).