Internal combustion engine
US-2026055722-A1 · Feb 26, 2026 · US
Combustion air
Combustion air · 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 | F02M31/13 |
| Official title | Combustion air |
| Display label | Combustion air |
| Total patents | 48 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 6 |
| 2017 | 4 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 5 |
| 2022 | 7 |
| 2023 | 4 |
| 2024 | 3 |
| 2025 | 7 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method of starting a compression ignition engine
US-12497939-B2 · Dec 16, 2025 · US
Systems and methods for coordinating an air blend valve with an intake air heater
US-12442352-B1 · Oct 14, 2025 · US
Injection device and electric heating device for corresponding injection device
US-12435687-B2 · Oct 7, 2025 · US
Engine control system for intake valve opening timing during cold start
US-2025290459-A1 · Sep 18, 2025 · US
Control method for an air intake intercooler that heats or cools intake air of an engine and a control system thereof
US-12359610-B2 · Jul 15, 2025 · US
Internal combustion engine with external circulation system and working method thereof
US-12313015-B2 · May 27, 2025 · US
Internal combustion engine with external circulation system and working method thereof
US-2025027458-A1 · Jan 23, 2025 · US
A control method for an air intake intercooler of an engine and a control system thereof
US-2024352886-A1 · Oct 24, 2024 · US
Work vehicle
US-12055089-B2 · Aug 6, 2024 · US
Injection Device and Electric Heating Device for Corresponding Injection Device
US-2024102433-A1 · Mar 28, 2024 · US
Work vehicle
US-2023392540-A1 · Dec 7, 2023 · US
Control method and apparatus applied to controller
US-11649790-B1 · May 16, 2023 · US
Vehicle having a hybrid drive
US-11585263-B2 · Feb 21, 2023 · US
Controlled charge air cooler accumulated water draining method by using throttle-plate delta pressure and metering orifice
US-11566560-B1 · Jan 31, 2023 · US
Engine glow plug disconnection detection method
US-11486344-B2 · Nov 1, 2022 · US
Method for controlling an internal combustion engine arrangement
US-11421631-B2 · Aug 23, 2022 · US
Vehicle having a hybrid drive
US-2022162983-A1 · May 26, 2022 · US
Methods and systems for a turbocharged engine
US-11333109-B2 · May 17, 2022 · US
Heating Device for an Exhaust System of an Internal Combustion Engine
US-2022090567-A1 · Mar 24, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F02M31/13?
- CPC F02M31/13 is the Cooperative Patent Classification code for “Combustion air.”
- How many patents are filed under CPC F02M31/13 (Combustion air)?
- Our database includes 48 publications tagged with this CPC code.
- Is patent activity under CPC F02M31/13 growing?
- Publication counts under this code: 3 in 2024 vs 7 in 2025 (latest complete years).