Nitrous oxide removal catalysts for exhaust systems
US-2017362984-A1 · Dec 21, 2017 · US
Specific surface
Specific surface · 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 | B01D2255/9207 |
| Official title | Specific surface |
| Display label | Specific surface |
| Total patents | 445 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 32 |
| 2016 | 21 |
| 2017 | 32 |
| 2018 | 36 |
| 2019 | 43 |
| 2020 | 47 |
| 2021 | 47 |
| 2022 | 64 |
| 2023 | 58 |
| 2024 | 33 |
| 2025 | 25 |
| 2026 | 7 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Mixed metal oxide composite for oxygen storage
US-2017333877-A1 · Nov 23, 2017 · US
Process for synthesizing a metal-doped aluminogallate nanocomposite and methods of use thereof
US-2017239648-A1 · Aug 24, 2017 · US
Alumina catalyst support
US-9731286-B2 · Aug 15, 2017 · US
Stability of Doped-Zirconia as Support Oxide for Copper-Manganese Zero-PGM Catalysts
US-2017095802-A1 · Apr 6, 2017 · US
Exhaust system having N2O catalyst in EGR circuit
US-9587591-B2 · Mar 7, 2017 · US
Improved Catalyzed Soot Filter
US-2017021338-A1 · Jan 26, 2017 · US
Highly active thermally stable nanoporous gold catalyst
US-9522387-B2 · Dec 20, 2016 · US
Catalytic member for purifying exhaust gases, and washcoat
US-2016332146-A1 · Nov 17, 2016 · US
Non noble metal based diesel oxidation catalyst
US-2016332118-A1 · Nov 17, 2016 · US
Start-up catalyst for use upstream of a gasoline particulate filter
US-9486793-B2 · Nov 8, 2016 · US
Metal-supported crystalline silicoaluminophosphate NOx-reducing catalyst
US-9468918-B2 · Oct 18, 2016 · US
Exhaust gas purifying catalyst
US-2016279607-A1 · Sep 29, 2016 · US
Cerium-Cobalt Spinel System as ZPGM Composition for DOC Applications
US-2016263561-A1 · Sep 15, 2016 · US
Porous carbon material composites and their production process, adsorbents, cosmetics, purification agents, and composite photocatalyst materials
US-2016243529-A1 · Aug 25, 2016 · US
Catalyst support for purification of exhaust gas, catalyst for purification of exhaust gas using the same, and method for producing the catalyst support for purification of exhaust gas
US-9409152-B2 · Aug 9, 2016 · US
Led photocatalyst module using photocatalyst
US-2016220721-A1 · Aug 4, 2016 · US
Particulate filter
US-2016214086-A1 · Jul 28, 2016 · US
Method for combusting diesel exhaust gas
US-9393522-B2 · Jul 19, 2016 · US
Catalyst and method of manufacture
US-9375710-B2 · Jun 28, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D2255/9207?
- CPC B01D2255/9207 is the Cooperative Patent Classification code for “Specific surface.”
- How many patents are filed under CPC B01D2255/9207 (Specific surface)?
- Our database includes 445 publications tagged with this CPC code.
- Is patent activity under CPC B01D2255/9207 growing?
- Publication counts under this code: 33 in 2024 vs 25 in 2025 (latest complete years).