Two-Stage Pump
US-2025361864-A1 · Nov 27, 2025 · US
Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids · 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 | F04C19/00 |
| Official title | Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids |
| Display label | Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids |
| Total patents | 25 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2018 | 6 |
| 2019 | 2 |
| 2020 | 6 |
| 2021 | 2 |
| 2022 | 1 |
| 2023 | 5 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Air extractor
US-2023375007-A1 · Nov 23, 2023 · US
Liquid blade pump
US-2023296095-A1 · Sep 21, 2023 · US
Liquid blade pump
US-2023279875-A1 · Sep 7, 2023 · US
Liquid ring pump control
US-11619232-B2 · Apr 4, 2023 · US
Apparatus and system for reducing vaccum pump noise
US-11607477-B2 · Mar 21, 2023 · US
A pump and a method of pumping a gas
US-2022213892-A1 · Jul 7, 2022 · US
Liquid ring vacuum pump
US-11143186-B2 · Oct 12, 2021 · US
Apparatus and system for reducing vaccum pump noise
US-2021244862-A1 · Aug 12, 2021 · US
Liquid ring fluid flow machine
US-10837443-B2 · Nov 17, 2020 · US
Abatement system
US-10702824-B2 · Jul 7, 2020 · US
Liquid ring pump
US-10655626-B2 · May 19, 2020 · US
Liquid ring vacuum pump
US-2020141410-A1 · May 7, 2020 · US
Apparatus for evacuating a corrosive effluent gas stream from a processing chamber
US-10625205-B2 · Apr 21, 2020 · US
Closed circulation system for production of a polymer solution and improving operating efficiency of a gas drainage pump used in a coal mine
US-10613554-B2 · Apr 7, 2020 · US
Closed circulation system for improving operating efficiency of gas drainage pump
US-2019286174-A1 · Sep 19, 2019 · US
Improved liquid ring pump
US-2019277287-A1 · Sep 12, 2019 · US
Method and apparatus for operating a gas turbine using wet combustion
US-2018334957-A1 · Nov 22, 2018 · US
Abatement system
US-10099169-B2 · Oct 16, 2018 · US
Abatement system
US-2018214812-A1 · Aug 2, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C19/00?
- CPC F04C19/00 is the Cooperative Patent Classification code for “Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids.”
- How many patents are filed under CPC F04C19/00 (Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids)?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC F04C19/00 growing?
- Publication counts under this code: 5 in 2023 vs 1 in 2025 (latest complete years).