Improved diesel particulate filter linearity with thin ash layer
US-2020378293-A1 · Dec 3, 2020 · US
by flow measuring
by flow 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 | B01D46/444 |
| Official title | {by flow measuring} |
| Display label | by flow measuring |
| Total patents | 129 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 10 |
| 2017 | 14 |
| 2018 | 11 |
| 2019 | 9 |
| 2020 | 13 |
| 2021 | 21 |
| 2022 | 12 |
| 2023 | 9 |
| 2024 | 13 |
| 2025 | 12 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vehicle air cleaner
US-2020340434-A1 · Oct 29, 2020 · US
Method and system for predicting replacement time of cartridge of air processing unit
US-2020318543-A1 · Oct 8, 2020 · US
Method, engine, and control system for controlling soot loading of exhaust gas aftertreatment components
US-2020300190-A1 · Sep 24, 2020 · US
Tubular air cleaner for internal combustion engine
US-10753320-B2 · Aug 25, 2020 · US
Particulate matter detection circuit and filter processing device
US-10746076-B2 · Aug 18, 2020 · US
Method and apparatus for integrating chemical and environmental sensors into an air purification filter through a reusable sensor post
US-2020179859-A1 · Jun 11, 2020 · US
Method and apparatus for integrating chemical and environmental sensors into an air purification filter through a reusable sensor post
US-10576407-B2 · Mar 3, 2020 · US
Optional device for electrical machine, and electrical machine
US-10582627-B2 · Mar 3, 2020 · US
Air sensor system
US-10551402-B2 · Feb 4, 2020 · US
Filtration, filter characterization, and methods and apparatuses therefor
US-10549228-B2 · Feb 4, 2020 · US
Exhaust treatment device for diesel engine
US-2019390588-A1 · Dec 26, 2019 · US
Method for determining a degree of loading of a filter
US-10512874-B2 · Dec 24, 2019 · US
Air flow conditioning device
US-2019321764-A1 · Oct 24, 2019 · US
Intake device
US-2019293032-A1 · Sep 26, 2019 · US
Exhaust unit
US-10406473-B2 · Sep 10, 2019 · US
Air intake device for engines
US-10337473-B2 · Jul 2, 2019 · US
Particulate matter detection circuit and filter processing device
US-2019195111-A1 · Jun 27, 2019 · US
Filter for a portable industrial air filtration device
US-10226729-B2 · Mar 12, 2019 · US
Air purifier, method for determining time to replace filter thereof, and device and method for determining filter replacement time pressure differential therefor
US-10188976-B2 · Jan 29, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D46/444?
- CPC B01D46/444 is the Cooperative Patent Classification code for “by flow measuring.”
- How many patents are filed under CPC B01D46/444 (by flow measuring)?
- Our database includes 129 publications tagged with this CPC code.
- Is patent activity under CPC B01D46/444 growing?
- Publication counts under this code: 13 in 2024 vs 12 in 2025 (latest complete years).