Non oriented electrical steel sheet, iron core, manufacturing method of iron core, motor, and manufacturing method of motor
US-2023349032-A1 · Nov 2, 2023 · US
Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines · 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 | B21D28/22 |
| Official title | Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines |
| Display label | Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines |
| Total patents | 89 |
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 | 3 |
| 2017 | 5 |
| 2018 | 3 |
| 2019 | 7 |
| 2020 | 5 |
| 2021 | 11 |
| 2022 | 14 |
| 2023 | 10 |
| 2024 | 11 |
| 2025 | 8 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Adhesively-laminated core manufacturing method and adhesively-laminated core manufacturing device
US-2023253140-A1 · Aug 10, 2023 · US
Device for manufacturing laminated iron core and method for manufacturing laminated iron core
US-11524327-B2 · Dec 13, 2022 · US
Shaft, rotor lamination and rotor for an electric machine, electric machine, vehicle, and method for producing a rotor
US-11522409-B2 · Dec 6, 2022 · US
Method for producing a sheet metal part
US-2022355358-A1 · Nov 10, 2022 · US
Manufacturing method of core for rotary electric machine
US-11482912-B2 · Oct 25, 2022 · US
Method for stacking punched lamination elements to form lamination stacks
US-2022241837-A1 · Aug 4, 2022 · US
Punching and clinching of metal sheets
US-2022219223-A1 · Jul 14, 2022 · US
Stator core plate manufacturing method, stator core plate, stator core, and mold
US-2022166295-A1 · May 26, 2022 · US
Manufacturing method of core for rotary electric machine
US-11309776-B2 · Apr 19, 2022 · US
Method for stacking punched lamination elements to form lamination stacks
US-2022111430-A1 · Apr 14, 2022 · US
Method for manufacturing iron core
US-11298739-B2 · Apr 12, 2022 · US
Method for manufacturing a core element, manufacturing apparatus of a core element, and method for manufacturing a divisional layer stack core
US-2022109354-A1 · Apr 7, 2022 · US
Method for manufacturing brake disc and brake disc
US-2022088667-A1 · Mar 24, 2022 · US
Adhesively-laminated core for stator, method of manufacturing same, and electric motor
US-2022052570-A1 · Feb 17, 2022 · US
Multi-layer blanking process and device for the manufacture of metal parts such as rotor and stator lamination sheets for an electric motor
US-2022008980-A1 · Jan 13, 2022 · US
Adhesively-laminated core, manufacturing method thereof, and electric motor
US-2021398734-A1 · Dec 23, 2021 · US
Laser assisted machining of electric motor cores
US-2021370445-A1 · Dec 2, 2021 · US
Process for blanking of metal parts
US-11135635-B2 · Oct 5, 2021 · US
Method of manufacturing laminated iron core
US-11117181-B2 · Sep 14, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B21D28/22?
- CPC B21D28/22 is the Cooperative Patent Classification code for “Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines.”
- How many patents are filed under CPC B21D28/22 (Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines)?
- Our database includes 89 publications tagged with this CPC code.
- Is patent activity under CPC B21D28/22 growing?
- Publication counts under this code: 11 in 2024 vs 8 in 2025 (latest complete years).