Process for the distillation of isocyanates
US-12509419-B2 · Dec 30, 2025 · US
Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F04C19/004 |
| Official title | {Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply} |
| Display label | Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply |
| Total patents | 37 |
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 | 6 |
| 2017 | 3 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 5 |
| 2021 | 5 |
| 2022 | 2 |
| 2023 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Liquid ring pump control
US-11619232-B2 · Apr 4, 2023 · US
Process for the distillation of isocyanates
US-2022380303-A1 · Dec 1, 2022 · US
Pressurized vapor cycle liquid distillation
US-11260316-B2 · Mar 1, 2022 · US
Liquid ring vacuum pump
US-11143186-B2 · Oct 12, 2021 · US
Compressor, air conditioning system and vehicle
US-11130389-B2 · Sep 28, 2021 · US
Pressurized vapor cycle liquid distillation
US-11123654-B2 · Sep 21, 2021 · US
Pressurized Vapor Cycle Liquid Distillation
US-2021170299-A1 · Jun 10, 2021 · US
Pressurized vapor cycle liquid distillation
US-10905971-B2 · Feb 2, 2021 · US
Pressurized Vapor Cycle Liquid Distillation
US-2020360832-A1 · Nov 19, 2020 · US
Liquid ring fluid flow machine
US-10837443-B2 · Nov 17, 2020 · US
Pressurized vapor cycle liquid distillation
US-10765963-B2 · Sep 8, 2020 · US
Liquid ring pump
US-10655626-B2 · May 19, 2020 · US
Liquid ring vacuum pump
US-2020141410-A1 · May 7, 2020 · US
Pressurized Vapor Cycle Liquid Distillation
US-2019381420-A1 · Dec 19, 2019 · US
Pressurized vapor cycle liquid distillation
US-10507403-B2 · Dec 17, 2019 · US
Fluid Transfer Using Devices with Rotatable Housings
US-2019368488-A1 · Dec 5, 2019 · US
Fluid transfer using devices with rotatable housings
US-10385851-B2 · Aug 20, 2019 · US
Exhaust bearing seat, screw compressor and air-conditioning unit
US-10302086-B2 · May 28, 2019 · US
Pressurized vapor cycle liquid distillation
US-10179298-B2 · Jan 15, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C19/004?
- CPC F04C19/004 is the Cooperative Patent Classification code for “Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply.”
- How many patents are filed under CPC F04C19/004 (Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply)?
- Our database includes 37 publications tagged with this CPC code.
- Is patent activity under CPC F04C19/004 growing?
- Publication counts under this code: 1 in 2023 vs 1 in 2025 (latest complete years).