Oil recovery system
US-2019368393-A1 · Dec 5, 2019 · US
of negative pressure
of negative pressure · 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 | F01M13/021 |
| Official title | {of negative pressure} |
| Display label | of negative pressure |
| Total patents | 118 |
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 | 7 |
| 2016 | 15 |
| 2017 | 10 |
| 2018 | 14 |
| 2019 | 18 |
| 2020 | 19 |
| 2021 | 12 |
| 2022 | 7 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Throttled PCV system for an engine
US-10480366-B2 · Nov 19, 2019 · US
Method and apparatus
US-10473006-B2 · Nov 12, 2019 · US
Control device for internal combustion engine
US-10385792-B2 · Aug 20, 2019 · US
Separation device, motor device, and separation method
US-2019242332-A1 · Aug 8, 2019 · US
Blow-by gas treatment device for internal combustion engine
US-2019234262-A1 · Aug 1, 2019 · US
Blow-by gas treatment device for internal combustion engine
US-2019234261-A1 · Aug 1, 2019 · US
Blow-by gas recirculation device for internal combustion engine
US-10352280-B2 · Jul 16, 2019 · US
Arrangement for removing blow-by gases from a crankcase of an internal combustion engine
US-2019170032-A1 · Jun 6, 2019 · US
Pump device for driving blow-by-gas
US-10253662-B2 · Apr 9, 2019 · US
Oil Separator for Separating Oil from Aerosol in a Combustion Engine
US-2019078475-A1 · Mar 14, 2019 · US
Venturi devices resistant to ice formation for producing vacuum from crankcase gases
US-10190455-B2 · Jan 29, 2019 · US
Cylinder head cover structure for engine
US-2019017420-A1 · Jan 17, 2019 · US
Vehicle with integrated turbocharger oil control restriction
US-10174650-B2 · Jan 8, 2019 · US
Method for crankcase ventilation in a boosted engine
US-2018334974-A1 · Nov 22, 2018 · US
Method for crankcase ventilation in a boosted engine
US-10100757-B2 · Oct 16, 2018 · US
Crankcase ventilating evacuator
US-10100720-B2 · Oct 16, 2018 · US
Control device for internal combustion engine
US-2018238253-A1 · Aug 23, 2018 · US
Method and system for boosted engine system
US-2018223751-A1 · Aug 9, 2018 · US
Blow-by gas recirculation device for internal combustion engine
US-2018187582-A1 · Jul 5, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01M13/021?
- CPC F01M13/021 is the Cooperative Patent Classification code for “of negative pressure.”
- How many patents are filed under CPC F01M13/021 (of negative pressure)?
- Our database includes 118 publications tagged with this CPC code.
- Is patent activity under CPC F01M13/021 growing?
- Publication counts under this code: 6 in 2024 vs 4 in 2025 (latest complete years).