Catalytically active particle filter having a high degree of filtering efficiency
US-2024017213-A1 · Jan 18, 2024 · US
Wall flow filters
Wall flow filters · 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 | B01D2255/9155 |
| Official title | Wall flow filters |
| Display label | Wall flow filters |
| Total patents | 1,123 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 67 |
| 2016 | 56 |
| 2017 | 78 |
| 2018 | 114 |
| 2019 | 107 |
| 2020 | 111 |
| 2021 | 143 |
| 2022 | 142 |
| 2023 | 113 |
| 2024 | 101 |
| 2025 | 76 |
| 2026 | 15 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Catalyst blends
US-2015375215-A1 · Dec 31, 2015 · US
Catalysed Soot Filter for Treating the Exhaust Gas of a Compression Ignition Engine
US-2015298059-A1 · Oct 22, 2015 · US
Copper CHA zeolite catalysts
US-9162218-B2 · Oct 20, 2015 · US
Exhaust gas purification system for internal combustion engine
US-2015292378-A1 · Oct 15, 2015 · US
IRON AND COPPER-CONTAINING CHABAZITE ZEOLITE CATALYST FOR USE IN NOx REDUCTION
US-2015290632-A1 · Oct 15, 2015 · US
Non-PGM catalyst for burning carbon soot, and filtration filter and exhaust gas post-processing apparatus using the same
US-9155999-B2 · Oct 13, 2015 · US
Honeycomb structure
US-2015273461-A1 · Oct 1, 2015 · US
DIESEL OXIDATION CATALYST WITH NOx ADSORBER ACTIVITY
US-2015273452-A1 · Oct 1, 2015 · US
Catalyzed SCR filter and emission treatment system
US-9144795-B2 · Sep 29, 2015 · US
Multi-component filters for emissions control
US-9145809-B2 · Sep 29, 2015 · US
Remote transactional memory
US-2015269116-A1 · Sep 24, 2015 · US
Catalyst for treating exhaust gas
US-2015265969-A1 · Sep 24, 2015 · US
Impurity doped UV protection layer
US-9136226-B2 · Sep 15, 2015 · US
Zoned catalysed substrate monolith
US-2015252708-A1 · Sep 10, 2015 · US
Catalyst blends
US-9126180-B2 · Sep 8, 2015 · US
Catalyzed soot filters, systems and methods of treatment
US-9126182-B2 · Sep 8, 2015 · US
Catalyzed SCR filter and emission treatment system
US-9121327-B2 · Sep 1, 2015 · US
Platinum group metal (PGM) catalyst for treating exhaust gas
US-9114376-B2 · Aug 25, 2015 · US
Method for the purification of diesel engine exhaust gases
US-2015231565-A1 · Aug 20, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D2255/9155?
- CPC B01D2255/9155 is the Cooperative Patent Classification code for “Wall flow filters.”
- How many patents are filed under CPC B01D2255/9155 (Wall flow filters)?
- Our database includes 1,123 publications tagged with this CPC code.
- Is patent activity under CPC B01D2255/9155 growing?
- Publication counts under this code: 101 in 2024 vs 76 in 2025 (latest complete years).