Filter systems
US-10137397-B2 · Nov 27, 2018 · US
by pressure measuring
by pressure measuring · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01D46/446 |
| Official title | {by pressure measuring} |
| Display label | by pressure measuring |
| Total patents | 311 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 14 |
| 2017 | 19 |
| 2018 | 27 |
| 2019 | 26 |
| 2020 | 42 |
| 2021 | 35 |
| 2022 | 28 |
| 2023 | 39 |
| 2024 | 32 |
| 2025 | 34 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Regulated vacuum off-gassing of gas filter for fluid processing system and related methods
US-2018334648-A1 · Nov 22, 2018 · US
Oil-gas separator assembly and internal combustion engine
US-10094256-B2 · Oct 9, 2018 · US
System and method for maintaining, monitoring and/or improving air quality and purity in at least one room or environment
US-2018264391-A1 · Sep 20, 2018 · US
Particulate matter sensor with engineered particle size cut-point
US-2018245499-A1 · Aug 30, 2018 · US
Method and System for Regenerating a Soot Particle Filter
US-2018238251-A1 · Aug 23, 2018 · US
Diverted pulse jet cleaning device and system
US-10035095-B2 · Jul 31, 2018 · US
System and method to detect and respond to iced sensors in exhaust after-treatment system
US-2018179940-A1 · Jun 28, 2018 · US
Hydrophobic filtration of tempering air
US-10005016-B2 · Jun 26, 2018 · US
Vehicle filter system
US-9987581-B2 · Jun 5, 2018 · US
Air filter condition sensing
US-2018140989-A1 · May 24, 2018 · US
Exhaust air cleaning apparatus and image forming apparatus
US-9977400-B2 · May 22, 2018 · US
Image forming apparatus
US-2018136602-A1 · May 17, 2018 · US
System and method for condition-based monitoring of turbine filters
US-2018073386-A1 · Mar 15, 2018 · US
Oil-gas separator assembly and internal combustion engine
US-2018058281-A1 · Mar 1, 2018 · US
Method and Apparatus for Cleaning a Dust Storage Container
US-2018042437-A1 · Feb 15, 2018 · US
Secondary system and method for controlling an engine
US-2018023523-A1 · Jan 25, 2018 · US
Exhaust gas control apparatus for internal combustion engine
US-2018016961-A1 · Jan 18, 2018 · US
Air Sensor System
US-2017370959-A1 · Dec 28, 2017 · US
Diesel particulate filter regeneration system
US-2017362977-A1 · Dec 21, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D46/446?
- CPC B01D46/446 is the Cooperative Patent Classification code for “by pressure measuring.”
- How many patents are filed under CPC B01D46/446 (by pressure measuring)?
- Our database includes 311 publications tagged with this CPC code.
- Is patent activity under CPC B01D46/446 growing?
- Publication counts under this code: 32 in 2024 vs 34 in 2025 (latest complete years).