Impeller bearings for pumps
US-2026022706-A1 · Jan 22, 2026 · US
joining shafts, e.g. rigid couplings, quill shafts
joining shafts, e.g. rigid couplings, quill shafts · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F04D29/0405 |
| Official title | {joining shafts, e.g. rigid couplings, quill shafts} |
| Display label | joining shafts, e.g. rigid couplings, quill shafts |
| Total patents | 25 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 2 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 7 |
| 2024 | 5 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Impeller bearings for pumps
US-12448982-B2 · Oct 21, 2025 · US
Axial flux motor driven pump systems for pressurizing fluid in closed loop systems
US-12421968-B2 · Sep 23, 2025 · US
Spring actuated axially locking shaft coupling for bi-directional loading
US-12421973-B2 · Sep 23, 2025 · US
Spring actuated axially locking shaft coupling for bi-directional loading
US-2024418176-A1 · Dec 19, 2024 · US
Spring actuated axially locking shaft coupling for bi-directional loading
US-12104613-B2 · Oct 1, 2024 · US
Impeller bearings for pumps
US-2024309882-A1 · Sep 19, 2024 · US
Impeller bearings for pumps
US-12000406-B2 · Jun 4, 2024 · US
Ring latch locking shaft coupling for bi-directional loading
US-11905802-B2 · Feb 20, 2024 · US
Impeller bearings for pumps
US-2023392605-A1 · Dec 7, 2023 · US
Axial flux motor driven pump systems for pressurizing fluid in closed loop systems
US-2023358235-A1 · Nov 9, 2023 · US
Ring latch locking shaft coupling for bi-directional loading
US-2023349274-A1 · Nov 2, 2023 · US
Spring actuated axially locking shaft coupling for bi-directional loading
US-2023349273-A1 · Nov 2, 2023 · US
Apparatus and method of rotational alignment of permanent magnet tandem motors for electrical submersible pump
US-11739742-B2 · Aug 29, 2023 · US
Shaft couplings for high tensile loads in ESP systems
US-11644065-B2 · May 9, 2023 · US
Electrical submersible pump (ESP) seal section service-less flange
US-11572886-B1 · Feb 7, 2023 · US
Apparatus and method of rotational alignment of permanent magnet tandem motors for electrical submersible pump
US-2022136490-A1 · May 5, 2022 · US
Apparatus and method of rotational alignment of permanent magnet tandem motors for electrical submersible pump
US-11261854-B2 · Mar 1, 2022 · US
Patch rings and methods of use
US-11174735-B2 · Nov 16, 2021 · US
Apparatus and method of rotational alignment of permanent magnet tandem motors for electrical submersible pump
US-2021199099-A1 · Jul 1, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04D29/0405?
- CPC F04D29/0405 is the Cooperative Patent Classification code for “joining shafts, e.g. rigid couplings, quill shafts.”
- How many patents are filed under CPC F04D29/0405 (joining shafts, e.g. rigid couplings, quill shafts)?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC F04D29/0405 growing?
- Publication counts under this code: 5 in 2024 vs 3 in 2025 (latest complete years).