Rotary pump having an adjustable specific delivery volume and a pressure equalization surface
US-11542940-B2 · Jan 3, 2023 · US
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by changing the form of the inner or outer contour of the working chamber
by changing the form of the inner or outer contour of the working chamber · 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 | F04C14/20 |
| Official title | by changing the form of the inner or outer contour of the working chamber |
| Display label | by changing the form of the inner or outer contour of the working chamber |
| Total patents | 15 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 2 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 2 |
| 2021 | 1 |
| 2022 | 1 |
| 2023 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dual chamber and gear pump assembly for a high pressure delivery system
US-11383025-B2 · Jul 12, 2022 · US
Rotary Pump Having an Adjustable Specific Delivery Volume and a Pressure Equalization Surface
US-2021246899-A1 · Aug 12, 2021 · US
Dual chamber and gear pump assembly for a high pressure delivery system
US-2019255250-A1 · Aug 22, 2019 · US
Dual chamber and gear pump assembly for a high pressure delivery system
US-10314967-B2 · Jun 11, 2019 · US
Stiffness tuning and dynamic force balancing rotors of downhole drilling motors
US-2018266181-A1 · Sep 20, 2018 · US
Rotary pump with a compact setting structure for adjusting the delivery volume
US-9932982-B2 · Apr 3, 2018 · US
Variable displacement vane pump
US-2017276132-A1 · Sep 28, 2017 · US
Variable-capacity vane pump
US-2017218953-A1 · Aug 3, 2017 · US
Variable displacement vane pump
US-9534595-B2 · Jan 3, 2017 · US
Variable capacity-type gear pump designing method, design support program for the pump, design support device for the pump, and variable capacity-type gear pump
US-2016238003-A1 · Aug 18, 2016 · US
Rotary pump with a compact setting structure for adjusting the delivery volume
US-2016177948-A1 · Jun 23, 2016 · US
Fluid device with flexible ring
US-9133830-B2 · Sep 15, 2015 · US
Variable displacement vane pump
US-2015240808-A1 · Aug 27, 2015 · US
Dual chamber and gear pump assembly for a high pressure delivery system
US-2015057612-A1 · Feb 26, 2015 · US