System and method for context aware networked mask with dynamic air impedance for optimum breathability
US-12502563-B2 · Dec 23, 2025 · US
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Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material
Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material · 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 | B01D2275/302 |
| Official title | Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material |
| Display label | Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material |
| Total patents | 11 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2017 | 1 |
| 2020 | 4 |
| 2022 | 2 |
| 2023 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Gas measurement device and gas measurement method
US-12379297-B2 · Aug 5, 2025 · US
Gas measurement device and gas measurement method
US-2023078944-A1 · Mar 16, 2023 · US
Gasoline particulate filters with high initial filtering efficiency and methods of making same
US-11441458-B2 · Sep 13, 2022 · US
System and method for context aware networked mask with dynamic air impedance for optimum breathability
US-2022233896-A1 · Jul 28, 2022 · US
Gasoline particulate filters with high initial filtering efficiency and methods of making same
US-2020370452-A1 · Nov 26, 2020 · US
Gasoline particulate filters with high initial filtering efficiency and methods of making same
US-10774708-B2 · Sep 15, 2020 · US
Gasoline particulate filters with high initial filtering efficiency and methods of making same
US-2020072102-A1 · Mar 5, 2020 · US
Bag filters having controlled air permeability and dust collectors using the same
US-10543444-B2 · Jan 28, 2020 · US
Bag filters having controlled air permeability and dust collectors using the same
US-2017216752-A1 · Aug 3, 2017 · US
System and method for a movable exhaust aftertreatment device in an internal combustion engine
US-9109496-B2 · Aug 18, 2015 · US