Stop control system for direct-injection type internal combustion engine
US-10151261-B2 · Dec 11, 2018 · US
Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · 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 | F01C21/18 |
| Official title | Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet |
| Display label | Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet |
| Total patents | 122 |
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 | 11 |
| 2016 | 14 |
| 2017 | 18 |
| 2018 | 19 |
| 2019 | 14 |
| 2020 | 19 |
| 2021 | 11 |
| 2022 | 7 |
| 2023 | 2 |
| 2024 | 6 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Rotary internal combustion engine
US-10138804-B2 · Nov 27, 2018 · US
Rotary internal combustion engine with pilot subchamber
US-10125676-B2 · Nov 13, 2018 · US
A composite intake system and method of the rotary engine with variable intake manifold
US-2018274501-A1 · Sep 27, 2018 · US
Rotary internal combustion engine with unequal volumetric ratios
US-2018223728-A1 · Aug 9, 2018 · US
Internal combustion engine with split pilot injection
US-10041402-B2 · Aug 7, 2018 · US
Double-working-medium expander used for two-stage organic rankine cycle
US-2018187549-A1 · Jul 5, 2018 · US
Engine intake assembly with selector valve
US-2018187591-A1 · Jul 5, 2018 · US
Rotary internal combustion engine with pilot subchamber
US-2018187593-A1 · Jul 5, 2018 · US
Rotary internal combustion engine with pilot subchamber
US-10006358-B2 · Jun 26, 2018 · US
Engine assembly with turbine support casing
US-9970295-B2 · May 15, 2018 · US
Compound engine assembly with coaxial compressor and offset turbine section
US-9932892-B2 · Apr 3, 2018 · US
Rotary internal combustion engine with exhaust purge
US-9926842-B2 · Mar 27, 2018 · US
Rotary internal combustion engine with pilot subchamber
US-2018080371-A1 · Mar 22, 2018 · US
Compound engine assembly with modulated flow
US-9896998-B2 · Feb 20, 2018 · US
Scissor type compression and expansion machine used in a thermal energy recuperation system
US-2018030858-A1 · Feb 1, 2018 · US
Engine intake assembly with selector valve
US-9879591-B2 · Jan 30, 2018 · US
Rotary fluid pressure device with drive-in-drive valve arrangement
US-2017362938-A1 · Dec 21, 2017 · US
Optimal expander outlet porting
US-2017350251-A1 · Dec 7, 2017 · US
Rotary internal combustion engine with variable volumetric compression ratio
US-9828906-B2 · Nov 28, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01C21/18?
- CPC F01C21/18 is the Cooperative Patent Classification code for “Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet.”
- How many patents are filed under CPC F01C21/18 (Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet)?
- Our database includes 122 publications tagged with this CPC code.
- Is patent activity under CPC F01C21/18 growing?
- Publication counts under this code: 6 in 2024 vs 1 in 2025 (latest complete years).