Fuel cell ejector
US-2024159251-A1 · May 16, 2024 · US
of multi-stage type
of multi-stage type · 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 | F04F5/22 |
| Official title | of multi-stage type |
| Display label | of multi-stage type |
| 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 |
|---|---|
| 2015 | 3 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 4 |
| 2020 | 3 |
| 2021 | 2 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Nozzle Appliance for a Jet Pump and Jet Pump
US-2023287903-A1 · Sep 14, 2023 · US
Multistage aspirator for inflatable assemblies
US-11560905-B2 · Jan 24, 2023 · US
Vacuum ejector systems
US-2022410039-A1 · Dec 29, 2022 · US
Check valve insert defining an open position and check valves having same
US-11486504-B2 · Nov 1, 2022 · US
Recovering waste oil
US-2022056926-A1 · Feb 24, 2022 · US
Multistage aspirator for inflatable assemblies
US-2021180616-A1 · Jun 17, 2021 · US
Purge system for fuel evaporation gas of vehicle
US-11022076-B2 · Jun 1, 2021 · US
Evacuation of a film chamber
US-10844877-B2 · Nov 24, 2020 · US
Purge system for fuel evaporation gas of vehicle
US-2020291902-A1 · Sep 17, 2020 · US
Pressure-controlling device, and pressure-using apparatus
US-2020088213-A1 · Mar 19, 2020 · US
Low-cost evacuator for an engine having tuned Venturi gaps
US-10480537-B2 · Nov 19, 2019 · US
Check valve insert defining an open position and check valves having same
US-2019323618-A1 · Oct 24, 2019 · US
Low-cost evacuator for an engine having tuned venturi gaps
US-2019234430-A1 · Aug 1, 2019 · US
Low-cost evacuator for an engine having tuned Venturi gaps
US-10273978-B2 · Apr 30, 2019 · US
Common vacuum header for cvi/cvd furnaces
US-2018274615-A1 · Sep 27, 2018 · US
Multistage ejector
US-9863443-B2 · Jan 9, 2018 · US
Pneumatically actuated vacuum pump having multiple venturi gaps and check valves
US-9657748-B2 · May 23, 2017 · US
Check valve with improved sealing member
US-9581258-B2 · Feb 28, 2017 · US
Evacuation of a Film Chamber
US-2016258448-A1 · Sep 8, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04F5/22?
- CPC F04F5/22 is the Cooperative Patent Classification code for “of multi-stage type.”
- How many patents are filed under CPC F04F5/22 (of multi-stage type)?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC F04F5/22 growing?
- Publication counts under this code: 2 in 2023 vs 1 in 2024 (latest complete years).