Device for treating exhaust gas from fuel cell
US-2024266569-A1 · Aug 8, 2024 · US
Perforated, multi-opening, with a plurality of holes
Perforated, multi-opening, with a plurality of holes · 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 | B01F25/31331 |
| Official title | {Perforated, multi-opening, with a plurality of holes} |
| Display label | Perforated, multi-opening, with a plurality of holes |
| Total patents | 131 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 10 |
| 2016 | 13 |
| 2017 | 10 |
| 2018 | 8 |
| 2019 | 18 |
| 2020 | 16 |
| 2021 | 17 |
| 2022 | 6 |
| 2023 | 11 |
| 2024 | 8 |
| 2025 | 13 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pipe Mixer for an Aftertreatment System
US-2019383194-A1 · Dec 19, 2019 · US
Exhaust duct for a fossil fuel powered engine comprising a dilution selective catalytic reduction system
US-2019345845-A1 · Nov 14, 2019 · US
Gas/gas mixer for introducing gas into the exhaust gas stream of an internal combustion engine
US-2019316549-A1 · Oct 17, 2019 · US
Tempering air system for gas turbine selective catalyst reduction system
US-10415834-B2 · Sep 17, 2019 · US
Mixing Reactor and Related Process
US-2019275493-A1 · Sep 12, 2019 · US
Methods for fluid contacting in a downflow vessel
US-10376856-B2 · Aug 13, 2019 · US
Mixer
US-2019226379-A1 · Jul 25, 2019 · US
Resistivity adjustment device and resistivity adjustment method
US-2019224633-A1 · Jul 25, 2019 · US
Separating carbon dioxide and hydrogen sulfide from a natural gas stream using co-current contacting systems
US-10343107-B2 · Jul 9, 2019 · US
In situ foam generation within a turbine engine
US-2019203610-A1 · Jul 4, 2019 · US
Mixing assembly
US-2019134576-A1 · May 9, 2019 · US
Exhaust system for a work vehicle
US-10273854-B1 · Apr 30, 2019 · US
Injection quill designs and methods of use
US-10258942-B2 · Apr 16, 2019 · US
Foaming nozzle of a cleaning system for turbine engines
US-2019107005-A1 · Apr 11, 2019 · US
Fuel cell stack inlet flow control
US-2019103621-A1 · Apr 4, 2019 · US
Suspension for enhanced oil recovery
US-10240079-B2 · Mar 26, 2019 · US
Method and Apparatus for Mixing Proppant-Containing Fluids
US-2019070575-A1 · Mar 7, 2019 · US
Methods for fluid contacting in a downflow vessel
US-2019030495-A1 · Jan 31, 2019 · US
Method and installation for ozone treatment of wastewater
US-2018312417-A1 · Nov 1, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01F25/31331?
- CPC B01F25/31331 is the Cooperative Patent Classification code for “Perforated, multi-opening, with a plurality of holes.”
- How many patents are filed under CPC B01F25/31331 (Perforated, multi-opening, with a plurality of holes)?
- Our database includes 131 publications tagged with this CPC code.
- Is patent activity under CPC B01F25/31331 growing?
- Publication counts under this code: 8 in 2024 vs 13 in 2025 (latest complete years).