Assembling apparatus for oil pump
US-10519823-B2 · Dec 31, 2019 · US
the pump being immersed in the reservoir
the pump being immersed in the reservoir · 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 | F04B23/021 |
| Official title | {the pump being immersed in the reservoir} |
| Display label | the pump being immersed in the reservoir |
| Total patents | 140 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 11 |
| 2017 | 7 |
| 2018 | 21 |
| 2019 | 17 |
| 2020 | 13 |
| 2021 | 17 |
| 2022 | 16 |
| 2023 | 12 |
| 2024 | 9 |
| 2025 | 11 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Chemical Changeover System
US-2019368478-A1 · Dec 5, 2019 · US
Closed circulation system for improving operating efficiency of gas drainage pump
US-2019286174-A1 · Sep 19, 2019 · US
Sewage basin pump control support
US-2019195215-A1 · Jun 27, 2019 · US
Wave energy isolation device and wave energy conversion equipment using the same
US-2019162161-A1 · May 30, 2019 · US
Cryogenic pump
US-2019145392-A1 · May 16, 2019 · US
Piston cartridge for piston pump
US-10273955-B2 · Apr 30, 2019 · US
Pet fountain
US-2019098866-A1 · Apr 4, 2019 · US
Machine system having submersible pumping system, and method
US-10240562-B2 · Mar 26, 2019 · US
Cryogenic fluid system and method of operating same
US-10240722-B2 · Mar 26, 2019 · US
Fuel Pump Solenoid Assembly Method
US-2019010909-A1 · Jan 10, 2019 · US
Asymmetric Spring Valve Disk
US-2019003603-A1 · Jan 3, 2019 · US
Combined Inlet and Outlet Check Valve Seat
US-2019003598-A1 · Jan 3, 2019 · US
Fuel Sending Unit Assembly and Operation
US-2019003474-A1 · Jan 3, 2019 · US
Pump Valve Configuration and Assembly Method
US-2019003605-A1 · Jan 3, 2019 · US
Fuel pump solenoid having hydraulic damping
US-2019003611-A1 · Jan 3, 2019 · US
Flexible hose for bellows pressure equalizer of electrical submersible well pump
US-10125759-B2 · Nov 13, 2018 · US
Systems and methods for resolving submersible pump failures
US-10112222-B1 · Oct 30, 2018 · US
Electrohydraulic Compact Assembly
US-2018274526-A1 · Sep 27, 2018 · US
Cooling of a Dewar vessel with ice free coolant and for short sample access
US-10066788-B2 · Sep 4, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04B23/021?
- CPC F04B23/021 is the Cooperative Patent Classification code for “the pump being immersed in the reservoir.”
- How many patents are filed under CPC F04B23/021 (the pump being immersed in the reservoir)?
- Our database includes 140 publications tagged with this CPC code.
- Is patent activity under CPC F04B23/021 growing?
- Publication counts under this code: 9 in 2024 vs 11 in 2025 (latest complete years).