Star pleating with inside out flow having water drainage through the center
US-12403415-B2 · Sep 2, 2025 · US
Housings with transparent parts
Housings with transparent parts · 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 | B01D2201/309 |
| Official title | Housings with transparent parts |
| Display label | Housings with transparent parts |
| Total patents | 47 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 2 |
| 2017 | 7 |
| 2018 | 3 |
| 2019 | 9 |
| 2020 | 4 |
| 2021 | 8 |
| 2022 | 1 |
| 2023 | 8 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Fuel-water separator systems and methods
US-12263426-B2 · Apr 1, 2025 · US
Oil filter housing and system
US-12060816-B2 · Aug 13, 2024 · US
Sand filter LED status light
US-11779863-B2 · Oct 10, 2023 · US
Bowl for filter assemblies
US-11781512-B2 · Oct 10, 2023 · US
Oil filter housing and system
US-2023313715-A1 · Oct 5, 2023 · US
Plural circuit oil filter
US-11713699-B2 · Aug 1, 2023 · US
Fuel-water separator systems and methods
US-2023219023-A1 · Jul 13, 2023 · US
Fuel-water separator systems and methods
US-11623169-B2 · Apr 11, 2023 · US
Sand Filter LED Status Light
US-2023090606-A1 · Mar 23, 2023 · US
Sand filter LED status light
US-11541333-B2 · Jan 3, 2023 · US
Star pleating with inside out flow having water drainage through the center
US-2022193579-A1 · Jun 23, 2022 · US
Fuel-water separator systems and methods
US-2021283539-A1 · Sep 16, 2021 · US
Oil filter/liquid indicator assembly
US-11111959-B2 · Sep 7, 2021 · US
Bowl for Filter Assemblies
US-2021254587-A1 · Aug 19, 2021 · US
Fuel-water separator systems and methods
US-11077393-B2 · Aug 3, 2021 · US
Bowl for filter assemblies
US-11028807-B2 · Jun 8, 2021 · US
Fuel pre-filtering element
US-11007459-B2 · May 18, 2021 · US
Plural circuit oil filter
US-2021062692-A1 · Mar 4, 2021 · US
Filtration device and filtration method
US-2021060459-A1 · Mar 4, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D2201/309?
- CPC B01D2201/309 is the Cooperative Patent Classification code for “Housings with transparent parts.”
- How many patents are filed under CPC B01D2201/309 (Housings with transparent parts)?
- Our database includes 47 publications tagged with this CPC code.
- Is patent activity under CPC B01D2201/309 growing?
- Publication counts under this code: 1 in 2024 vs 2 in 2025 (latest complete years).