Linear or trench drain systems
US-12546102-B2 · Feb 10, 2026 · US
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Open sewage channels
Open sewage channels · Cooperative Patent Classification (CPC)
Building, mining, and civil engineering structures.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | E03F3/046 |
| Official title | {Open sewage channels} |
| Display label | Open sewage channels |
| Total patents | 20 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2017 | 2 |
| 2018 | 3 |
| 2019 | 1 |
| 2021 | 5 |
| 2022 | 1 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Linear drain assembly
US-12460401-B2 · Nov 4, 2025 · US
Structure for attaching grating lid onto resin trough body; trough track; trough track forming method; and grating lid
US-12334720-B2 · Jun 17, 2025 · US
Linear drain assembly
US-2024295112-A1 · Sep 5, 2024 · US
Drainage apparatus with locking mechanism
US-2024287783-A1 · Aug 29, 2024 · US
Linear drain assembly
US-12006677-B2 · Jun 11, 2024 · US
Frame for a floor drain
US-11773580-B2 · Oct 3, 2023 · US
Structure for attaching grating lid onto resin trough body; trough track; trough track forming method; and grating lid
US-2023216287-A1 · Jul 6, 2023 · US
Floor drain
US-11536016-B2 · Dec 27, 2022 · US
Linear Drain Assembly
US-2021381216-A1 · Dec 9, 2021 · US
Floor Drain
US-2021355671-A1 · Nov 18, 2021 · US
Trench drain connection interface
US-11053674-B2 · Jul 6, 2021 · US
Frame for a Floor Drain
US-2021189712-A1 · Jun 24, 2021 · US
Method for protecting ecology of coastal mudflat and system used in the method
US-2021161109-A1 · Jun 3, 2021 · US
Trench drain bridge and clip attachment for the same
US-10352032-B2 · Jul 16, 2019 · US
Flexible modular trench
US-10132070-B2 · Nov 20, 2018 · US
Trench Drain Bridge and Clip Attachment for the Same
US-2018209132-A1 · Jul 26, 2018 · US
Trench Drain Connection Interface
US-2018209131-A1 · Jul 26, 2018 · US
Flexible Modular Trench
US-2017314251-A1 · Nov 2, 2017 · US
Trench Drain With Overmolded Frame
US-2017175374-A1 · Jun 22, 2017 · US