Multi-cylinder internal combustion engine, with cylinders equipped with intake valve variable actuation systems having hydraulic circuits which cross each other
US-12247502-B2 · Mar 11, 2025 · US
between cam and valve stem
between cam and valve stem · 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 | F01L1/25 |
| Official title | between cam and valve stem |
| Display label | between cam and valve stem |
| Total patents | 31 |
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 | 5 |
| 2017 | 4 |
| 2018 | 5 |
| 2019 | 5 |
| 2020 | 3 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Multi-cylinder internal combustion engine, with cylinders equipped with intake valve variable actuation systems having hydraulic circuits which cross each other
US-2025020072-A1 · Jan 16, 2025 · US
Internal combustion engine with fast combustion and method of control of such an engine
US-11692465-B2 · Jul 4, 2023 · US
Internal combustion engine with fast combustion and method of control of such an engine
US-2022243621-A1 · Aug 4, 2022 · US
Switching tappet or a roller finger follower for compression release braking
US-11377985-B2 · Jul 5, 2022 · US
Gasoline engine knock control
US-10947912-B2 · Mar 16, 2021 · US
Switching tappet or a roller finger follower for compression release braking
US-2020208547-A1 · Jul 2, 2020 · US
Engine valve lifter having anti-rotation plug
US-10690016-B2 · Jun 23, 2020 · US
Torque modulation for internal combustion engine
US-10612475-B2 · Apr 7, 2020 · US
Gasoline engine knock control
US-2019368430-A1 · Dec 5, 2019 · US
Determining sliding camshaft actuator pin position based on engine crankshaft angle
US-10344734-B2 · Jul 9, 2019 · US
Valve bridge assembly
US-10260382-B2 · Apr 16, 2019 · US
Valve train assembly
US-10190446-B2 · Jan 29, 2019 · US
Determining sliding camshaft actuator pin position based on engine crankshaft angle
US-2019003446-A1 · Jan 3, 2019 · US
Engine valve lifter having anti-rotation plug
US-2018363513-A1 · Dec 20, 2018 · US
System and method for variable actuation of a valve of an internal-combustion engine, with a device for dampening pressure oscillations
US-10156163-B2 · Dec 18, 2018 · US
Engine valve lifter oil flow control and anti-rotation feature
US-10132208-B2 · Nov 20, 2018 · US
Variable valve mechanism for internal combustion engine
US-10066518-B2 · Sep 4, 2018 · US
Actuator for an electrohydraulic gas-exchange valve train of a combustion engine
US-9920664-B2 · Mar 20, 2018 · US
Variable valve mechanism for internal combustion engine
US-2017342869-A1 · Nov 30, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01L1/25?
- CPC F01L1/25 is the Cooperative Patent Classification code for “between cam and valve stem.”
- How many patents are filed under CPC F01L1/25 (between cam and valve stem)?
- Our database includes 31 publications tagged with this CPC code.
- Is patent activity under CPC F01L1/25 growing?
- Publication counts under this code: 1 in 2023 vs 2 in 2025 (latest complete years).