Intravascular blood pump having multilayer coreless coils
US-2024399136-A1 · Dec 5, 2024 · US
Air-gap windings, i.e. iron-free windings
Air-gap windings, i.e. iron-free windings · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H02K3/47 |
| Official title | Air-gap windings, i.e. iron-free windings |
| Display label | Air-gap windings, i.e. iron-free windings |
| Total patents | 444 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 14 |
| 2016 | 13 |
| 2017 | 24 |
| 2018 | 31 |
| 2019 | 40 |
| 2020 | 42 |
| 2021 | 52 |
| 2022 | 68 |
| 2023 | 48 |
| 2024 | 63 |
| 2025 | 38 |
| 2026 | 11 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Axial Gap Type Rotating Electric Machine and Stator
US-2018351419-A1 · Dec 6, 2018 · US
System, method and apparatus for modular axial field rotary energy device
US-10141804-B2 · Nov 27, 2018 · US
Phantom electric motor system with parallel coils
US-10128789-B2 · Nov 13, 2018 · US
System and apparatus for modular axial field rotary energy device
US-2018198339-A1 · Jul 12, 2018 · US
Surgical instrument motor with increased number of wires per phase set and increased fill factor and corresponding manufacturing method
US-9979247-B2 · May 22, 2018 · US
Linear motor, stage apparatus, and exposure apparatus
US-2018046092-A1 · Feb 15, 2018 · US
Micro fan
US-2018026494-A1 · Jan 25, 2018 · US
Motor air flow cooling
US-2018006517-A1 · Jan 4, 2018 · US
Primary element of an ironless linear motor
US-2017373579-A1 · Dec 28, 2017 · US
Wound rotor synchronous motor for vehicle
US-2017353092-A1 · Dec 7, 2017 · US
Multi-phase linear motor with continuously wound coils in each phase
US-9837884-B2 · Dec 5, 2017 · US
Compressed motor winding
US-9825497-B2 · Nov 21, 2017 · US
Stator winding heat sink configuration
US-2017331339-A1 · Nov 16, 2017 · US
Slotless brushless motor-driven throttle valve device, engine, and vehicle
US-2017328285-A1 · Nov 16, 2017 · US
Safety System for an Assembly for Moving Transport Bodies
US-2017331359-A1 · Nov 16, 2017 · US
Electric motor
US-9806588-B2 · Oct 31, 2017 · US
Linear motor, stage apparatus, and exposure apparatus
US-9804508-B2 · Oct 31, 2017 · US
Active part of an electric machine
US-2017310185-A1 · Oct 26, 2017 · US
Heat sink for a linear motor
US-9777972-B2 · Oct 3, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H02K3/47?
- CPC H02K3/47 is the Cooperative Patent Classification code for “Air-gap windings, i.e. iron-free windings.”
- How many patents are filed under CPC H02K3/47 (Air-gap windings, i.e. iron-free windings)?
- Our database includes 444 publications tagged with this CPC code.
- Is patent activity under CPC H02K3/47 growing?
- Publication counts under this code: 63 in 2024 vs 38 in 2025 (latest complete years).