Coiling machine, method for manufacturing coil spring, and coil spring
US-11964321-B2 · Apr 23, 2024 · US
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internally on a hollow form
internally on a hollow form · 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 | B21F3/06 |
| Official title | internally on a hollow form |
| Display label | internally on a hollow form |
| Total patents | 7 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 1 |
| 2020 | 2 |
| 2021 | 1 |
| 2024 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
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US-10052677-B2 · Aug 21, 2018 · US
Coiling machine and manufacturing method of coil spring
US-2017348759-A1 · Dec 7, 2017 · US
Spring forming device and forming method therefor
US-2016243607-A1 · Aug 25, 2016 · US